Please allow the option to show %health on enemy and/or ally champions on their health bar.
Let's be honest, there are so many %health interactions in this game that this can only benefit and help people with their abilities.
A Darius can see what % he manages to heal for.
A Jhin can see the enemies remaining health to determine if his execute is good enough.
An Irelia can see if she will stun with her E or not.
And many more.