Comment 1 for bug 1421056

I'll look at this when I have some time (since the odfpy library is
abandonware, I tend to approach making changes to it with some
trepidation). In the meantime, you could just save your ODT files as
DOCX, calibre has its own DOCX engine that supports many more features
than odfpy, including this one (docx footnotes and endnotes are
auto-converted to nicely formattted endnotes with big backlinks, well
suited for use with a touchscreen).