Or use "footnotes", I think in LibreOffice or Word they can map to links when you make an ebook. Some readers can pop them up in a box and others put it on a fresh page when you tap, then tap on footer or back button to return to original text.
I was looking at how to do format a "Plot your own adventure" in Word/LibreOffice. There is even an original mobi html element that marks an end you can't go past with "next page" thus navigation only by choice in links at end of each "chapter". I don't know yet if the epub2 or KF8/AZW supports it.
(LibreOffice may be better than Word now for making eBooks, even saveAs docx and using Calibre)
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