Questions about Flood Custom Games.

I want to make a flood gametype but I can’t seem to find the option where once the flood dies the round ends. Is it possible? If so can someone tell me how to do it because I don’t want to end the game and restart, end the game and restart, etc.

I think the easiest way to do it would be to set the Lives Per Round to 2

1 Life as a Spartan, 1 Life as a Flood.
Obviously the Alpha Flood would have 2 lives.