How to crop and pan a Flipbook sprite animation?

I have a sprite animation that I want to use as the “fill” on a round health bar. I can’t figure out how to crop and pan the animation inside the health bar though. Basically, this (the first screenshot) is what I’m trying to achieve and the second screenshot is my current setup

I’ve searched on the forums but can’t seem to figure out how to achieve this. Any help or suggestion is appreciated. Thanks!