How to override GameSession?

In CreateSession I can’t specify addition parameters. I need to SET SessionName in CreateSession and GET SessionName, Max and Current Players in TWO team (they must perform different function, and players need to know what roles are left).

GameSessionClass varable in GameMode class

Set it in AGameMode constructor, it also settable in defaults of this class in blueprints

Thank you. I was looking for it in GameInstance.