Can we have the incoming heal estimation number be color coded on a sliding scale (percentage threshold)?

E.g.

I'm healing a target and the overheal is
-a lot, like 20% over max HP = red
-moderate 10% over max HP = orange
-equal / +/- 5% to max HP = current green color

edit --
On 2nd thought months later - this should definitely be an "advanced" tab option because it could easily confuse new healers who don't know certain expected damage incoming in specific situations and cancel heals leading to a death. Only for experienced users. Maybe it could also be class configurable for different thresholds for certain target classes.