how to retrieve pivot data from another relationship in API resource

I have 3 models: User, Suburb, City

City hasMany Suburb and Suburb belongsTo a City.

User belongsToMany City and City belongsToMany User.

Suburb belongsToMany User.

There are two pivot tables between these models, and I am using the same API resource User for the response.

class User extends JsonResource
{
public function toArray($request)
{
return
[
'id' => $this->id,
........
];
}

}

Now in Suburb page I want to retrieve a field valid_from from City_User pivot table data, So I tried

return [
'valid_from' => $this->whenPivotLoaded('city_user', function(){
return $this->pivot->valid_from;
})
]

However, this returns null as $this->whenPivotLoaded seems point to Suburb-User pivot table not City-User. So this works fine if I navigate to the City page.

I also tried

return [  
$this->mergeWhen($this->relationLoaded('city'), function () {
return [
'valid_from' => $this->pivot->valid_from,
];
}),]

City-User relation is loaded but still no luck.

dd($this):

AppHttpResourcesUser {#900
+resource: AppUser {#837
#table: "user"
#guarded: []
#connection: "mysql"
#primaryKey: "id"
#keyType: "int"
+incrementing: true
#with: []
#withCount: []
.....

User Model:

    public function city(): BelongsToMany
{
return $this->belongsToMany(City::class, 'city_user')
->withPivot('valid_from')
;
}

What I did wrong?

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