Resource whenPivotLoaded not showing relation

[BaeleMarco]

How can I add this relation to my resource to only show it when it's loaded?

I have this pivot between Module And File with an added language_id to this pivot

'pivot' => $this->whenPivotLoaded('module_file', fn () => [
    'sequence'      => $this->pivot->sequence,
    'language_id'   => $this->pivot->language_id,
    'language_code' => $this->whenLoaded('language', $this->pivot->language->code), // Doesn't show
    'language_code' => $this->pivot->whenLoaded('language', $this->pivot->language->code), // Error
    'language_code' => $this->whenPivotLoaded('language', $this->pivot->language->code), // Doesn't show
]),

The Language relation doesnt even show when I just use

'pivot' => $this->whenPivotLoaded('module_file', $this->pivot),
'pivot' => $this->whenPivotLoaded('module_file', fn () => $this->pivot),

How would this work?