The logic is like the CPlayer sturct, ZA AI has ModelInstance/LTObject too but unlike players, ZA AI's doesn't have Cplayer structs, you'll need to directly find the ModelInstance/LTObject.
You firstly need to get the ModelInstance/LTObject/(or the CPlayer + 0x8 offset) of an object, of course you'll ask where do you find the CPlayer of an AI Zombie right?
Here ->
https://www.mpgh.net/forum/showthread.php?t=1418537, study some threads so that you could locate the object storage/list/database or whatever they call it. You'll be also need to learn how to use C.E. or at least reclass (it's better if you can use both).
After you successfully find the ModelInstance/LTObject of the object you want to draw, just do it like the player esp. GetBonePosition(ModelInstance(of a ZA AI), boneHead, bla bla);
goodluck have fun.
Study this too.
https://www.mpgh.net/forum/showthread.php?t=1385663
Thanks to these only people that replied to me and lend help @
vaisefud3 and memorythepast