I think creating the data is the problem. The "Stacks" table holds the info that is displayed. The "Keywords" table is the cross reference between the book and the Stack.
The author keyword is just some text and a reference to an image. The book wide ones seem to be basically the same. But there is a value in the Keyword column.
For the word links, they appear to work via a search term. The value in the Keywords column of the Keywords table the search term. It appears to search for the term in the chapter and marks the first match with a link. I have just changed the keywords used as a test for this and it worked.
From my little bit of playing, it appears to be possible to add the BtB info for sideloaded kepubs. But, creating the info would be the problem.
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