The OP knows Calibre can do it. Hopefully someone has a copy, archive.org for domain hasn't or is broken, but I found this which "works" in the sense of a download that downloads.
https://web.archive.org/web/20210113...1.12-setup.msi
Gives a 1.5 Mbyte download windows msi, which I can't install as I run Linux.
It may be a plugin for MSWord?
Via this post
https://www.mobileread.com/forums/sh...8&postcount=11