In the publishing world, book printing is usually prepared with the help of DTP software, such as InDesign or Quark XPress. To easily bring a novel manuscript with text markup into a book layout, there is the "XPress Tags" format for QX. I have written a Python script that can export yWriter projects as a whole in this format.
Unlike importing Word files, where QX 2015 crashed on my PC occasionally, this method has worked robustly so far.
So if there are any QX users among you, they might want to take a look at this:
Cheers,
Peter