How to add some aiplayer when a real player is waitting?

How to add some aiplayer when a real player is waitting? if a real player waiting for 10sec in a lobby,i want to add a aiplayer to enter the lobby to play with him

About 10sec I think I would try to use relaxation:


and if you want this “air player” to be replaced with a real player mid game, I would use backfilling. it should allow you to add more players after the match already started.