Hi – great question!
We actually switched away from PDFs in recent versions to help increase the customizability of tickets, amongst other reasons. This is definitely possible, though, but is no longer a feature of the plugin and would, I’m afraid, require to be developed as a piece of custom development work.
However, we’d be more than happy to consider any feature requests you might make about this (or if you see a suitable existing request, please do just add your support to that instead).
Thanks!