100% that's the way, but json is still necessary. This and all kinds of things the app might be doing is not trivial to design for, at least for me. 

 this is why I put it as challenge to rob xD 

 good point on the nip/kind distinction though. I think by nip makes sense. 

 I think manually defining categories may be better than NIPs because some NIPs you may want to only partially authorize for