I don't know about a custom spell ability, i know there ins;t a custom affliction *my personal pet request*
However, there is an antry called "Generic Ability" that you can add in the added abilities section. It's not as customizable as the generic ability you can add when building custom monsters (it doesn't allow you to give it the action or reaction tags for instance) but it does allow you to add a name and description that can show up in your characters ability section on the right of the play screen
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