They didn't ask for anything like that for NASS, so I'm guessing at this level they wouldn't. The whole NASS application was online and they kind of take you at your word for everything, and it's very "fill in the bubble" or "yes/no". Not a lot of room for additional information, or no real way to submit something like that. Shoot - even for the actual application, all the letters of recommendation for Navy (unlike AF) were online. As we've said though, I think for NASS they're primarily looking for PSAT/ACT/SAT scores and class rank - going to be hard to differentiate for STEM if people don't have those scores (and similar ranks/GPA's).
I did think about it and actually my sons probably won't be applying right on the first since we don't even have finals here until next week and they won't have their GPA's and ranks until probably a few weeks later. My junior could use his current one (but he thinks he'll move up some this time), but my freshman doesn't even technically have a rank yet (although it should be #1 so he'll wait for confirmation of that!).