In the \GameMechanics\Spell\Creature_Abilities\Haven folder, there is a file called LayHands.xdb

Inside, it looks like this:

Header

   
   
   
   
   
   
       
   
    0
    MAGIC_SCHOOL_SPECIAL
    0
    true
    0
   
   
   
        0
        0
        0
        0
        0
        0
        0
   
    false
    false
    TARGET_FRIEND
    ELEMENT_NONE
   
       
   

You need this line:    

It contains a link to some placeholder; you can insert the path to the resurrection icon, for example.

If you want to create something of your own, you need to extract the texture xdb file from somewhere....

See how I did it here with the repair ability; if you have any questions or problems, I will help.