Feature Request: Add books as merch option

As an author, I have made a tier that gets exclusive extended versions of my books, including deleted scenes, illustrations, and alternative points of view for key scenes. I would love to offer a physical copy option rather than just eBooks, but since the book is exclusive to Patreon the only way to currently do this is to order all the books myself and store them.
It would be really helpful for me, and I expect others as well, to have the option to publish a book only on Patreon and let Patreon’s get it shipped directly from there. Like the other merch options, it doesn’t need a big variety, just a standard format to make it easy for all parties.