For what it's worth, I 100% perfectly solved this problem for myself MANY years ago and still use it just about every day.

On Android, it's called "Blitzmail," I'm pretty sure there's an Apple equivalent.

Beautifully simple app; on one touch it pops open a text box (which you can type, dictate to, also do "shares/attachments")

And emails to one and only one pre-specified address, usually "yourself."

From there, pick your poison. I personally have a dedicated address/account for these, and I have some bash scripts that pick them up and move them around, but I imagine for many "checking that email address periodically" would be sufficient.

I do exactly the same, except via a button in the quick settings panel, using Tasker, so I don't have to go to the home screen. It's incredibly useful. I hope this can be configured to make the notes emails to yourself.