diff --git a/packages/apps/nats/Chart.yaml b/packages/apps/nats/Chart.yaml
index cbb30f92a..02b9fa18a 100644
--- a/packages/apps/nats/Chart.yaml
+++ b/packages/apps/nats/Chart.yaml
@@ -16,7 +16,7 @@ type: application
 # This is the chart version. This version number should be incremented each time you make changes
 # to the chart and its templates, including the app version.
 # Versions are expected to follow Semantic Versioning (https://semver.org/)
-version: 0.3.1
+version: 0.4.0
 
 # This is the version number of the application being deployed. This version number should be
 # incremented each time you make changes to the application. Versions are not expected to
diff --git a/packages/apps/nats/README.md b/packages/apps/nats/README.md
index 96a59def4..239e86966 100644
--- a/packages/apps/nats/README.md
+++ b/packages/apps/nats/README.md
@@ -4,9 +4,13 @@
 
 ### Common parameters
 
-| Name           | Description                                     | Value   |
-| -------------- | ----------------------------------------------- | ------- |
-| `external`     | Enable external access from outside the cluster | `false` |
-| `replicas`     | Persistent Volume size for NATS                 | `2`     |
-| `storageClass` | StorageClass used to store the data             | `""`    |
-| `users`        | Users configuration                             | `{}`    |
+| Name                | Description                                        | Value   |
+| ------------------- | -------------------------------------------------- | ------- |
+| `external`          | Enable external access from outside the cluster    | `false` |
+| `replicas`          | Persistent Volume size for NATS                    | `2`     |
+| `storageClass`      | StorageClass used to store the data                | `""`    |
+| `users`             | Users configuration                                | `{}`    |
+| `jetstream.size`    | Jetstream persistent storage size                  | `10Gi`  |
+| `jetstream.enabled` | Enable or disable Jetstream                        | `true`  |
+| `config.merge`      | Additional configuration to merge into NATS config | `{}`    |
+| `config.resolver`   | Additional configuration to merge into NATS config | `{}`    |
diff --git a/packages/apps/nats/templates/nats.yaml b/packages/apps/nats/templates/nats.yaml
index 8a08ba3b4..3e843ccfd 100644
--- a/packages/apps/nats/templates/nats.yaml
+++ b/packages/apps/nats/templates/nats.yaml
@@ -40,8 +40,9 @@ spec:
     nats:
       fullnameOverride: {{ .Release.Name }}
       config:
-        {{- if gt (len $passwords) 0 }}
+        {{- if or (gt (len $passwords) 0) (gt (len .Values.config.merge) 0) }}
         merge:
+          {{- if gt (len $passwords) 0 }}
           accounts:
             A:
               users:
@@ -49,6 +50,14 @@ spec:
                 - user: "{{ $username }}"
                   password: "{{ $password }}"
                 {{- end }}
+          {{- end }}
+          {{- if and .Values.config (hasKey .Values.config "merge") }}
+          {{ toYaml .Values.config.merge | nindent 12 }}
+          {{- end }}
+        {{- end }}
+        {{- if and .Values.config (hasKey .Values.config "resolver") }}
+        resolver:
+          {{ toYaml .Values.config.resolver | nindent 12 }}
         {{- end }}
         cluster:
           enabled: true
@@ -58,10 +67,10 @@ spec:
         jetstream:
           enabled: true
           fileStore:
-            enabled: true
+            enabled: {{ .Values.jetstream.enabled }}
             pvc:
               enabled: true
-              size: 10Gi
+              size: {{ .Values.jetstream.size }}
               {{- with .Values.storageClass }}
               storageClassName: {{ . }}
               {{- end }}
diff --git a/packages/apps/nats/values.schema.json b/packages/apps/nats/values.schema.json
index df176502f..8943647a6 100644
--- a/packages/apps/nats/values.schema.json
+++ b/packages/apps/nats/values.schema.json
@@ -16,6 +16,36 @@
             "type": "string",
             "description": "StorageClass used to store the data",
             "default": ""
+        },
+        "jetstream": {
+            "type": "object",
+            "properties": {
+                "size": {
+                    "type": "string",
+                    "description": "Jetstream persistent storage size",
+                    "default": "10Gi"
+                },
+                "enabled": {
+                    "type": "boolean",
+                    "description": "Enable or disable Jetstream",
+                    "default": true
+                }
+            }
+        },
+        "config": {
+            "type": "object",
+            "properties": {
+                "merge": {
+                    "type": "object",
+                    "description": "Additional configuration to merge into NATS config",
+                    "default": {}
+                },
+                "resolver": {
+                    "type": "object",
+                    "description": "Additional configuration to merge into NATS config",
+                    "default": {}
+                }
+            }
         }
     }
 }
\ No newline at end of file
diff --git a/packages/apps/nats/values.yaml b/packages/apps/nats/values.yaml
index 6b2205be7..57f6580cc 100644
--- a/packages/apps/nats/values.yaml
+++ b/packages/apps/nats/values.yaml
@@ -15,3 +15,49 @@ storageClass: ""
 ##     password: strongpassword
 ##   user2: {}
 users: {}
+
+jetstream:
+  ## @param jetstream.size Jetstream persistent storage size
+  ## Specifies the size of the persistent storage for Jetstream (message store).
+  ## Default: 10Gi
+  size: 10Gi
+
+  ## @param jetstream.enabled Enable or disable Jetstream
+  ## Set to true to enable Jetstream for persistent messaging in NATS.
+  ## Default: true
+  enabled: true
+
+config:
+  ## @param config.merge Additional configuration to merge into NATS config
+  ## Allows you to customize NATS server settings by merging additional configurations.
+  ## For example, you can add extra parameters, configure authentication, or set custom settings.
+  ## Default: {}
+  ## example:
+  ##
+  ##   merge:
+  ##     $include: ./my-config.conf
+  ##     zzz$include: ./my-config-last.conf
+  ##     server_name: nats
+  ##     authorization:
+  ##       token: << $TOKEN >>
+  ##     jetstream:
+  ##       max_memory_store: << 1GB >>
+  ##
+  ## will yield the config:
+  ## {
+  ##   include ./my-config.conf;
+  ##   "authorization": {
+  ##     "token": $TOKEN
+  ##   },
+  ##   "jetstream": {
+  ##     "max_memory_store": 1GB
+  ##   },
+  ##   "server_name": "nats",
+  ##   include ./my-config-last.conf;
+  ## }
+  merge: {}
+  ## @param config.resolver Additional configuration to merge into NATS config
+  ## Allows you to customize NATS server settings by merging resolver configurations.
+  ## Default: {}
+  ## Example see: https://github.com/nats-io/k8s/blob/main/helm/charts/nats/values.yaml#L247
+  resolver: {}
diff --git a/packages/apps/versions_map b/packages/apps/versions_map
index 6ad48e5e5..10acaffd5 100644
--- a/packages/apps/versions_map
+++ b/packages/apps/versions_map
@@ -52,7 +52,8 @@ mysql 0.5.2 HEAD
 nats 0.1.0 5ca8823
 nats 0.2.0 c07c4bbd
 nats 0.3.0 78366f19
-nats 0.3.1 HEAD
+nats 0.3.1 b7375f73
+nats 0.4.0 HEAD
 postgres 0.1.0 f642698
 postgres 0.2.0 7cd7de73
 postgres 0.2.1 4a97e297