OK!
https://github.com/gingerbeardman/fsnotes-alfred-workflow
Regarding Scope, the path is `~/Library/Mobile Documents/iCloud~co~fluder~fsnotes/Documents` on my Mac.
At `~/Library/Containers/co.fluder.FSNotes/Data/Documents` I do see some example documents but they are not my files.
So, I'll ask at FSNotes.