These can be used within an OBS Browser Source. It will be high-quality within OBS still though. Using &broadcast, &roombitrate=0 or &novideo are options there. To achieve more than around 7-guests though, you will likely want to disable video sharing between guests. Share the blue link to invite guests who will join the chat automatically. You can host a group chat with friends using a room.

This is the director's control-room for the group-chat.