How do I end a custom campaign?

Hi everyone. I'm loving Wargroove but I can't work out how to end a custom campaign. I am able to specify which map is to be the final one but when a playthrough of the map is completed nothing happens to indicate that it's the end of the game.

I can put a cutscene within the map to play after victory - is that the only way of saying to the player "congratulations, you win!"?

Thanks a lot!