Touch of the Magi WeakAura help

I have looked at weakauras and haven’t found what I want. I am trying to create a weakaura to track the amount of damage that will be done by Touch of the Magi (id 210824) at the end of the debuff. I can get it to trigger when the debuff is applied but I do not know how to get it to show the damage. I can see the amount of damage when I mouse over the debuff and that is what I want displayed for the aura. Any help would be greatly appreciated.