Is it possible to add effects to monster that were summoned by Metamorphosis?

[Zethen]

Hi! I just knowing that there's the way to add special effects to the monster like MVP aura. I tried add it and yeah it's work! (but only with @monster command, not for Metamorphosis)

I'm planning to make my custom mob uses his Metamorphosis to change his forms with effects, but the effects won't be shown.
soooo I'm curious that is it possible to add those special effect to the mob that spawned with Metamorphosis?

Thanks in advanced!