Hi @dave-greeko,
It’s Possible first create a custom module then module set in custom app after that create a print format in custom module.
when you create a print format and save it then automatically print format add in custom app path like: custom_app/custom_app/custom_app/print_format/your_print_format_folder/your_print_format.json
Then Remove content in html line:
Then create a new file your_print_format.html and some code add to test your print format.
check code in image:
check in print format:
Thank You!