Absorb health enchantment

I was wondering how one would stat this? My original idea was roll 2D3 and heal for 1/x (x = what you rolled) so for example you roll a 1 (2 raw) and a 3 (6 raw) so you take 1/4 of your damage as heals. This probably doesn't work very well so if there's a better method pls tell me.

Thanks

Absorb health enchantment