Append at runtime on eager loaded relations using with()

Feature submitted by @jessarcher with https://github.com/laravel/framework/pull/33422 is really useful!

It would be more useful if we could append at runtime on eager loaded relations instead of the model itself. Tried to do the following but appends array seems to be overridden. Is this intended behaviour?

UserResource::collection(
    User::with([
        'profile' => fn ($q) => $q->getModel()->append('given_name'),
    ])->get()
);

Off course, a possible workaround would be to append on the query result like below but it adds overhead with no reason.

UserResource::collection(
    User::with([
        'profile' => fn ($q) => $q->getModel()->append('given_name'),
    ])->get()->map(fn (User $item) => tap($item, fn($item) => $item->profile->append('given_name')))

laravel / ideas

Append at runtime on eager loaded relations using with() #2484