I think this would be very useful, heres an idea of how it would look

The image is from another modpack, but should be pretty self explanatory. Btw thanks for this awesome mod ;D

I have no intention of adding extra features like that, so that is a no. If you want something similar you could use the mod "overflowing bars" since it adds a number next to the hearts which represents the amount of heart layers you have. The mod is compatible with this one in case you want to use both.