How can I export Calibre books into the macOS Books.app?
I mainly care about PDFs at this point, but of course it would be nice if other formats could also be exported into Books.app.
I like that Books.app is automatically syncing to iOS.
I've been playing with CalibreCompanion but it's a bit tedious to have to "share" documents with other applications from there. (And the CalibreCompanion directory functionality seems broken.)
update: Ideally I'd like to synchronize with Books.app just like I can sync with a Kindle or any other ebook reader. I can open the paths from Calibre and drop files into Books but this is very tedious when handling many books.