Hi, I was going through some things on different itch pages and saw your question again. I know this is WAY late to be realizing you were probably asking how I made the digital browser version of the zine and not the actual zine. Any way! maybe I did answer your question accurately back then, but just in case I didn't...
I used this HTML5 Reader for Electric Zine Maker by Jeremy Oduber
and instead of using the electric zine maker to make the zine, I used PNG files I created in Canva.
I see now when I glanced through your profile that you have some in browser creations. Glad you were able to come across it.
~Angel