Laravel backpack: CRUD for polymorphic relations

I recently switched over to Laravel Backpack to manage my Admin Panel, but I am having a major issue right now.

I have Pages, Articles and Titles in my Database.

A Page or Article can have many Titles (each for a different language, a german title, english title, etc.), so they are connected via polymorphic 1:n relation:

public function titles()
{
    return $this->morphMany('App\Models\Title', 'titleable');
}

Now, when I edit my Page (or Article), I want to also be able to edit all related titles. From what I understood, this is not possible at all in backpack and I am quite surprised that there is no native support to show a model's polymorphic relations when editing it.

Did I miss something or is this not possible at all with backpack?

Thank you for any advice.

via Chebli Mohamed