Health App
I think it would be very useful if we could add notes to the entered Health data. For example, I could write short notes that my entered Pulse is 1 hour after a 30 mins exercise. Or the entered blood pressure is before taking the X pills, etc. It would be useful to learn experiences how your body reacts on exercises, pills, foods, drinks, etc. It might be that it isn't the right place to request a feature like that but I could not find a better developer access.
iPhone XS