@
Inakami - Using an EPUB editor, add an empty Epub XHTML file, put it at the end of the book, and then type or copy & paste what you want. I have no idea what links are available from different websites.
If it's just for yourself there's probably no need to semantically tag the file with "back-matter" - which is only available for EPub3 books.
When I wrote: "
The only ways I can think of ... or write a plugin ... or put links", I hoped to infer I don't actually do this
BR