Referencing Individual Video Call Participants as a Browser Source

Many use discord to play/broadcast D&D and/or podcasts using streaming programs like OBS.  I typically end up adding multiple instances of the same source and then cropping it to fit the video frame of the user I want to feature.  Then, I move that around on the overlay where it makes sense.  If anything changes like someone joining/leaving the call or opening/closing a stream, it throws everything off.  It would be extremely helpful to be able to reference someone's specific call as a browser source.  Maybe it would be in the menu when you right-click on that person's call; maybe something like "get url".  This would give so much flexibility in this regard.  Someone has technical difficulties and is dropped?  Doesn't matter because everyone else is still in position.