A kind 31990 event of any client that handles writing articles should be published, and reference it inside each article written in that client so it could be displayed like this. It’s N/A because no event of that kind of such client was found.
nostr:npub1yzvxlwp7wawed5vgefwfmugvumtp8c8t0etk3g8sky4n0ndvyxesnxrf8q Another quality of life improvement would be publisher attribution on long form. I've only ever seen "N/A" in this field.
Discussion
My point is that you could check for that condition and either not display the field or display something for useful than “N/A”.