Thank you both for your suggestions,
@pennym and
@mouschievous, I will try these!
Wanted to add an update for anyone doing a future search:
After some more research, I came across a feature called "Disney check", where meals that adhere to certain healthy nutritional guidelines are designated with a mickey head and a check mark. They still don't provide individual nutritional value per meal, but at least there is a specification of what the guidelines are, so it's possible to know more or less what you're consuming (it's available on the Disney website). Seems like the program is aimed at children, but the nutritional values look like they would fit a balanced lunch for many adults (maybe with an added side or some improvisation). Hopefully this helps someone, as I was not aware it exists.