How to check a player team?

I am trying to make a mod that works with another mod, the other mod uses teams as checks so means I can somehow communicate with it, I feel like I saw it once but I can't find a procedure to check if a player is in a particular team,

would appreciate ur help :))

Also, I am trying to avoid a per-tick procedure because I know I can do it with commands but I am trying to avoid performance issues