this would require closed eye blendshapes on the model, which you can find directly under eyelook. you can add eyes looking up and down as well to make them widen and close depending on where you look like real eyes.
Gonna ref this topic JUST IN CASE the edit I've done in the package didn't fully save. I've also left a small tutorial note in the project for good measure too! ٩(ˊᗜˋ*)و ♡
I was looking for answers myself, but alas, it seems this is the way to go...
Which may be an issue for me because the model I have on hand seems to have been using gizmos and custom scripting to get their animations. Which there are a lot.
I might have to learn something rather complex...