Oh sorry didnt understand ur question, Sorry

Another thing you can do is create an entity and set it to MOVETYPE_FOLLOW, this will kinda attach it to players, then you can filter the entity in FM_AddToFullPack forward and then limit its transmission to specific players (like displaying it to only player's teammate as you want)
For eg: My
Sprites on HUD plugin uses FM_AddToFullPack forward for showing the sprite to its owner only and not to other players, you can look at it for an eg.
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