For MarginNote 3 users who are using obsidian or want to migrate to obsidian, MarginNote Companion is ready to be published! You can now use MarginNote 3 to read and create text/area excerpt on PDF files and easily import notes to obsidian with backlinks to MarginNote. It even support importing video notes (with media extended plugin installed)!
Check repo for introduction and guide: https://github.com/aidenlx/marginnote-companion
You can create an issue on GitHub if there is any feature request or feedback.