Filter hook to add new menu item:
apply_filters('ns_addon/add_menu_items', $menu_items);
Usage:
add_filter('ns_addon/add_menu_items', function($menu){
$items = [
'nadim-bhai' => [
'parent' => 'ninja-support-shortcuts-menu',
'title' => 'Nadim Bhai',
'url' => 'admin.php?page=nadim_bhai',
]
];
return array_merge($menu, $items);
}, 10, 1);