Can I have "sanpaku” eyes?

The lower eyelids can be lowered in a way that can show more of the white of the eye. This would be done with a few stitches under the eyelashes that should heal well.

Lowering the eyelid to show sclera will cause you dry eye. The lower eyelid needs to rest at the limbus of the eye for the purpose of protecting the eye. Mess with this at risk of you eye health. Don't do this to yourself and don't let a well meaning surgeon stupidly do this to you. You would actually benefit from upper eyelid ptosis surgery to brighten your eye appearance. That of course the opposite aesthetic that you are asking about. Stay safe out there.