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I'm over-simplifying and maybe you already know this, but an epub is just a bunch of html/xhtml/xml files in a zip file with the extension ".epub". Rename an epub so it has an extension of ".zip" and open it with your preferred zip tool.
Edit the appropriate html file and insert a HTML table. Zip it back up and you've editted an epub. Rename it back to .epub.
Calibre has a book editor that allows you to directly edit the content of an epub without manually renaming and unzipping, etc. Sigil is a program that essentially does the same as the Calibre editor tool. It can be run as a stand-alone program, or you can use it from inside Calibre if you prefer the Sigil editor to the Calibre editor, but still want to use Calibre for its other functionality.
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