Either, export your Apple Notes as Markdown:

https://apps.apple.com/us/app/exporter/id1099120373?mt=12

Or use the official Importer:

https://help.obsidian.md/import/apple-notes

Btw, Shortcuts can slam things into your Obsidian vault because it's just text files. That can be as fast or faster than Notes. You might need a shortcuts helper like Toolbox Pro that can remember a path to your vault and write to it from your shortcuts:

https://apps.apple.com/us/app/toolbox-pro-for-shortcuts/id14...