Export Single Image to PDF for printing A4 Paper

Hey guys!
I make children’s learning videos. Recently switched from Studio to Harmony. Wondering how I can export an image that has the proper dimensions for printing on a regular printer. Specifically it’s worksheets for the students and teachers to use, so I’d like to have the eventual image a PDF file that is the right format/dimension for printing.

Any help would be much appreciated!

Thank you.