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. A group room can handle up to around 30 guests, depending on numerous factors, including CPU and available bandwidth of all guests in the room.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.