Re-activating this and updating the title. As pointed out by one of the voters, OneNote for Windows 10 does not allow sharing individual pages from a work or school notebook.
To be clear, OneNote 2016 is not going away, and you can use it as long as you’d like.
Thank you again for all your responses.
We would like to get more feedback on which of the two scenarios are more important to you:
1. The ability to create new pages in OneNote from markdown? OR
2. The ability to recall OneNote pages as markdown?moqiao commented