Add NR Book Artifacts in Landscape orientation?

We are using a Book to gather PDF's and reports built in NR together to publish a book. The book must be published in "landscape" orientation. The NR-built reports were formatted for landscape, so those come into the book as expected. However, when we add a PDF artifact to the book, by default it previews in portrait orientation. So when previewing the book, the PDF artifacts show as portrait, and the reports are landscape. Currently, the only workaround is to manually rotate the pages in a PDF editor, which is a tedious process. Is it possible to set orientation from