Regeneration Enchantment for armor

So basically I got this idea from one of my favorite games, Shadow fight 2. You could add a new Regeneration enchantment which applies to armors only. For example, Regeneration 1 could be a chance to regenerate 3% of your health per second for 5 seconds after being hit, Regeneration 2 a chance to regenerate 5% of your health per second for 5 seconds after being hit, and so on. You guys can even decrease or increase the chance or the health regen percentage if you want to. At first I though it would only be activated if the player was hit by another player, but then I though that it'd be fun if the same thing happened if the player were to be hit by a mob, too.