A similar idea has been posted, but I want to make another point. Given you’re current framework where each page is a separate file, it should be relatively simple to add a way (probably the Share drawer icon) to copy that page file address link and paste it in other apps where if i click the link it would open GoodNotes up and show me that page.

Bonus points if this link could be SHARED to other GoodNotes users (who do not even have the file) and it could open up that page on THEIR Mac/iPad/iPhone etc. This would be incredible in case someone missed a meeting at work or in school and they want to share the note really quick, but not their entire notebook.