Wie bekomme nur einen Parameter aller Objekte in einem Array in Laravel

$patients_id = FollowUpQuestionsAfterSurgery::
orderBy('id' , 'desc')
->pluck("patient_id");

$patients = Paitent::whereIn("id" , $patients_id)->get()->->toArray();


return array_column($patients , "follow_up");
Mohamad