I have documented a workflow to take annotations created with Bookends to a format that can be recognized in markdown-aware apps such as Devonthink and Obsidian. The approach works also to provide "picture" annotations in an asset folder and to expose #hashtag markings that are otherwise hidden inside the URL link, for example  becomes #result a figure .
Further details are posted the MPU Forum at this link.
https://talk.macpowerusers.com/t/batch- ... dian/24470