Can the 'hero skill comparison' condition be custom skills ?

What I saw in the combo box under the hero skill tab was only the pre-made hero skills. Can I choose a custom skill ?

For custom skills, just choose the skill that your Custom Ability is based on and it'll work.

For custom skills, select the custom skill's name. For example, if you name your custom skill "Fire", then just select the ability called "Fire".

If you are using ROC you have to make the trigger Custom Text, then add the Custom Skill id in instead of the old skill.