Heal All spell

Hi
Can you make the Heal All spell work for undead as a reverse of Harm All? Harm and Heal relation work correctly already. It's probably the most potent spell against undead so fixing it would help.
Can you make the Heal All spell work for undead as a reverse of Harm All? Harm and Heal relation work correctly already. It's probably the most potent spell against undead so fixing it would help.