Afaik you do not because it is not a game and and are most likely not making the revenue mentioned below?
Once you’ve begun collecting money for your product, you’ll need to track gross revenue and pay a 5% royalty on that amount after $1,000,000 in gross revenue is earned. To report your earnings, complete and submit the royalty form on a quarterly basis.
Probably a good idea to check with an admin about this or contact UE directly