PUN how to make universal chat?

How to make a universal chat Photon Unity Networking?

task
1) to send messages from a lobby ( not in the rooms, just connect to the server ) to all players who lobby and in the rooms or only players in certain rooms or only certain players
2) send messages to the room all the players who are in a lobby and in the rooms or only players in certain rooms or only certain players

questions
1) is it possible to do this using PUN?
2 ) if so is there a ready-made solution ?
3) if it is possible but there is no solution , tell me how to solve these problems , show examples?

Examples PUN chat for rooms . and while I can not solve the problem .

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