Same here... 4 years have passed since the last message, any news? Notes are useful for example to track supplements intakes and right now I'm doing this on TrainingPeaks, where I'm able to add notes for the APP and from the website.
On Garmin Connect (website) it's possible to add and read notes, but they are invisible from the Android APP.
Garmin Connect Web works in the web browser on the phone: https://connect.garmin.com/modern/calendar
That's the opposite of what we need, navigating it on the tiny screen is a huge pain
I just confirmed with support that this is impossible. They suggested requesting the idea here: https://www.garmin.com/forms/ideas/