Export book from Books with annotations included

A book was sent to me for correction in .epub format. It seemed reasonable to add dozens of notes/annotations via Books. There are solutions for exporting notes separately. But, to my enormous astonishment, I can't find any way of exporting a complete file of the book (PDF, ePub, .docx, whatever...) with the corrections included to send it back to the author. This would be hours of wasted work, even though it looks like such a basic function. Thank you for your help!