Thoughts about a map annotations feature

Been thinking about how I make annotations to paper maps and how that helps in route planning.

Was wondering if it would be possible to add a feature of annotations to the map in the form of pinned notes and also highlighted sections of road/track also with a text note.  These would be independent of a planned route and just appear as part of the background map.

Maybe with the ability to make some annotations public and subscribe to other users additions.

Export elevation profile for a route

Was wondering if it would be possible to add a function to export distance/elevation data of a route to a CSV or JSON file.  Ideally just a text representation of the elevation plot.

Would help for me to get this data into a spreadsheet so I can plot climbing effort (and descending!) along a long route to give better estimates of checkpoint times.