Additional pronoun tag "himself" for exam questions

I recently wrote an exam question that used the phrase “but [AP he] has to figure out the actual value for [AP himself].” The “himself” tag was not recognized by JudgeApps, so I rewrote the question slightly.
Would it be possible to add “himself” to the list of supported pronoun tags?

Update: I finally realized I could just use “[AP him]self.” So this falls under “no change necessary” after all.