It seems like <prefix>-LICENSE.txt is a not-totally-uncommon format for license filenames; for example: MIT-LICENSE.txt or GPL-LICENSE.txt.

Perhaps it'd be possible to adjust the filename matching to permit finding more license files.

Figuring out why a license wasn't being found involved a bunch of debugging that pinpointed the regex responsible, so I'll also offer a pull request with a potential changeset alongside this request.