I have a many to many relation between User and Task. The pivot table acts as an "Inbox" view on the user's tasks and is defined as a custom model, which is nice...

public function tasks()
{
    return $this->belongsToMany(Task::class, 'inbox_messages')
                        ->withPivot('read', 'pinned', 'suggested', 'last_viewed_at')
                        ->withTimestamps()
                        ->using(Inbox::class)
                        ->as('inbox');
}

However, when I want to query Tasks, I feel kinda limited when querying the pivot table...

For example, I want to query for Tasks that were viewed today and are pinned...

$tasks = Auth::user()->tasks()
                    ->wherePivot('pinned', true)
                    ->wherePivot('last_viewed_at', Carbon::today)
                    ->get();

But I actually want to be able to write it as follows, reusing the local scopes I have already defined on my Inbox pivot model...

$tasks = Auth::user()->tasks()
                    ->wherePivotPinned()
                    ->wherePivotViewedToday()
                    ->get();

Even better would be something like this, using the pivot accessor in the Builder method...

$tasks = Auth::user()->tasks()
                    ->whereInboxPinned()
                    ->whereInboxViewedToday()
                    ->get();

Maybe it's already possible but undocumented?

If not, how could this functionality be implemented?