If a package like libjs-quill was created, this package would have to go through the NEW queue before it would be accepted in the Debian archives. Earlier packages in this queue always took considerable time before they were reviewed and accepted. Based on earlier experience with new packages in Debian, I would expect that this Bibledit package will long have been removed automatically from testing. So although creating libjs-quill would be the right thing to do, I am inclined to take the quicker route this time around, and just satisfy the bug report, and that's it. Satisfying the bug report is, as the bug states, to include the source code that leads to the minified Javascript. That looks a reasonable approach just now, and something that can be done in time before Bibledit is removed from the testing distribution.
At the same time it looks wise to me if someone files a bug that libjs-quill would need to be packaged. Then if libjs-quill is available, Bibledit could eventually switch to using this new package. But this is something for the longer term. It's not a short-term solution to this bug report.