A Command to change Mob Behavior

Hello all!

I recently started creating custom mobs for a build I'm doing, and I was considering setting up battles between certain factions in my world, but then I realized, there are very few mobs that actually fight each other.

So my idea is that perhaps there could be a command to change mob behavior to make them hostile, neutral or friendly towards certain mobs. The command could look like this (say I want a Wither Skeleton to attack a Zombie but not a Skeleton):

/summon wither_skeleton ~ ~ ~ {MobBehavior; minecraft:zombie: hostile, minecraft:skeleton, neutral,} 

This Command I think would allow so much more to be done with mobs and fantasy worlds if you could change their behavior as well as their name, armor and weapons.

Thanks for Reading!