Not sure if Valve are offering this to third party games yet, or if it’s something Fireteam could look into, but game state integration basically allows game events to update a player controlled HTTP endpoint, to do things like monitor health, ammo, headshots, respawn timer, ability cooldowns, etc.
For more information this is how you’d do it in CSGO: Counter-Strike: Global Offensive Game State Integration
Here are some example use cases: