Chalice Labyrinths (Pthumer Labyrinth). Co-op in these locations (Bloodborne)

People! The question is: is there any kind of co-op in these locations? The call bell, like the small ringing bell, rings there, but no matter how much it rings, complete silence. As I understand it, these locations were made by the developers for the co-op, it seems that they even announced it themselves, and it would be more fun to wander around them with someone. Perhaps some other way of calling is provided there, and indeed, who knows what on this topic, I will be grateful for the answer.