Annotations are stored in the EPUB file by default. So simply add the epub file again to your library and you will get all the annotations from a separate book record. And if you want to export annotations from a particular format you can do so via the calibre viewer, by opening the highlights side panel and clicking export.
I am not going to accept a control in the annotations browser for a per format export as its a niche use case already covered by exporting via the viewer.
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