Thanks, DoctorOhh.
It seems to work, but I did only one try, and maybe this was not an experimentum crucis:
I changed the Calibre output setting, then dropped an ODT source I made with a cover as first page, into the books list, converted it to epub, then dropped a new cover into the folder, and launched the plugin with only "Insert or change cover" checked, and the cover was "xMiYMid meet". I did not open the ebook editor before using the plugin, as it automatically reloads the new cover.jpg.
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