for my school project i have to recreate Secret Hitler game using socket.io/express/vuejs2.

And at the moment I'm stuck at the part where i should create lobby that other people should be able to join. I used rooms for the lobby, but then i realized that it's not what i need. What i though of is when person creates a lobby, a name will be assigned to that specific lobby so other user will be able to join that lobby by inserting the name of it or using the link which would look something like that http://mygame.com/?lobby=ABCD. But if i got socket.io rooms correctly, i wont be able to do that, because you can't create unique rooms. Or I'm just dumb and haven't figured that out yet.

So my question is how could i implement lobbies based on my idea using socket.io and expressjs? What documentation should i read?