Keep the same Etherpad document between sessions?

I installed Jitsi from docker and Etherpad as standalone service, and configured them to work together.
All works fine, but each time I open the same room (e.g., my_room_for_certain_project) and open etherpad, it starts a new document. Is there a way to keep the same document between sessions, i.e., bind the document path with the room name?
(of course, I can save the document and reopen it, but this is not the option I need, because I use etherpad with whiteboard module which is yet another separate service, and it is essential for me to preserve it too)