I created my own personalized bullet journal template in Keynote and exported it as PDF. That PDF is now a template that I use in GoodNotes 5 to create new notebooks whenever I want one based on the bujo template.
The main things are to set up pages in portrait mode in Keynote. To get the dot-grid background, add a large table with small cells and dotted borders.
So, I invested 20-30 minutes building out this template and got exactly what I was looking for. (Those tabs on the side are active links to the destination page – which are preserved in the PDF and by GoodNotes.)
Katie