Mobs that change texture or position/model

A feature that will take mcreator mobs to a next level. There should be a procedure or another thing that can change a mob texture/model. This feature will make mobs looking like vanilla mobs (a lot of mobs use that feature, for example:

• Wolf or cat that sit and change texture when tamed
• Ghast that open his mouth and eyes when shooting a fireball
• Enderman open their mouth and shake when they are angry
• Bee eyes become red when they are angry
• Pufferfish that grow
• Panda sit/play
• Shulker hide themselve
• Some illagers when they do their magic
• Enderdragon open his mouth and breath purple fire
• Fox sit and sleep
• Guardian spikes get out
• Creeper flash white
• And their is more!!

)

Instead of custom animations, this is a most simple way to open to so much possibility. I know what the answer will be: you can just make a copy of the mob with another texture/model but you know that some things cant be done like that.