Trying to create a "Bounty" mode

Ok here’s the gist.

I’m trying to create an FFA mode where the goal is to attack only the target the player is assigned and vice versa. Trying to keep combat relegated to a One-on-One scenario.

Health is rewarded upon a target kill, and after the target is killed another target is highlighted for the player that remains.

The ultimate goal is to mitigate random encounters and cut back on the chaos of a deathmatch to allow players to get some practice with heroes in a controlled aspect. Think CSGO pre-game warmup cage matches as an inspiration.

How would I go about creating this?

alright so I know I’m very late, if your still active on the forums I’ll try to provide an explanation