You're editing a book or writing one? I usually finish up my books in Word, so the last time I had endnotes (footnotes really don't work in e-books) I ran the *.doc through a clean-up utility and opened the resulting html in Sigil. (Normally I edit the html myself in a text editor, but I didn't want the labor of creating back-and-forth links.) Required some cleanup, but worked just fine.
Ideally, though, one would want to put the return link at the beginning of the paragraph or anyhow the sentence, so the reader isn't left hanging with just a number or asterisk at the top of the "page."
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