Need help with clipping the iris texture to the iris base layer.

TaKaYa9TailS

My question is the same as this 2020 thread with pictures that explain the problem well
https://community.live2d.com/discussion/707/stacking-dual-clipping

Basically, it is clipping the iris texture to the iris base layer.
and clipping it to the whiteseyes layer

But it turns out that the texture of the black eye would overflow

Now, what are the solutions to do this technique?

on any painting software we can fix this by clipping iris texture to iris base layer then clipping them all in a folder.
Next we just clipping the folder to the white eye and it works good,
but now live2d can't apply the clipping feature on folder right??