@Artie
Personally, I use Calibre which has its own section in this forum.
You can download the software here...
https://calibre-ebook.com/download
It allows you to manage your library as well as having a built in ereader and an ebook editor.
If you haven't worked with css and html before plus learning the ins and outs of a new software package, it will initially be an uphill battle (from personal experience), but once you realise how html and css work together, it fall together quite quickly. The software is pretty easy to understand, but there is a small learning curve.
You create the tables in epub files, so there is no exporting involved. Once you have created your epub file, added css code to the stylesheet, you can create the table.
Best to take it a step at a time. Install the software, add a couple of books, open one of the books in the editor and become familiar with it. I am sure there are plenty of members here that can help guide you.
It will also help if you have a screenshot of how you want the table to look. Post it here by clicking on the paperclip icon in the editors bar above.