No love for the Apocrypha though it seems ;-). Not being Catholic, I don't know how much teaching is done out of those books, but this might reach a larger audience if the books to show were configurable.
However, I will also note that the Book of Mormon itself is no longer under copyright. The footnotes, indexes and chapter summaries are copyright protected but the book itself is not. So, really, it wouldn't be particularly hard to make a Book of Mormon rest api.