I doubt it.
Joplin is a database app and the print instructions are likely to be quite different to Obsidian’s.
If you want a simple pre-packed solution, one option is to wait until you have access to Live Preview and see if you can achieve a PDF there that you are happier with. It would probably be worth trying more than one theme (again, I know).
The alternative is to try opening the file in different markdown editors (eg Typora, though that’s no longer free) and see whether you prefer the PDF export from one of them.
The next option would be to ask in the Obsidian Appearance Discord. But they are likely to need much more information about what exactly you’re not happy with at the moment before they could help. Though maybe another ex-Joplin user could help.
One of the issues is that only a small number of users are interested in the detail of print styling (that’s true in Joplin too).
Might be worth adding Joplin to the thread title, since ex-Joplin users may have more insight into what you are looking for.