You must make sure you have linebreaks around that entered markup, the prefix/suffix editor is a bit hard to use but linebreaks are inserted with option+return. I’ve added a Raw Typst style in my template for you to look at. I also added a Section Type to demonstrate another way to format the blocks of content. I added a Raw Typst table so you can see.
Yes, that is totally possible. I added a basic TXT Typst output in that template — select compile for Plain Text and select “Pure Typst”. It compiles directly and runs Typst to make a PDF. You have to be aware you lose in the convenience functions that Scrivener has built for markdown, where is converts RTF heading level, lists, figures with captions, tables etc. to the correct markdown. You also lose the benefits of a Pandoc intermediate (flexible conversion to other outputs, metadata for authors etc, advanced bibliography tools, powerful filters). But if you are happy with Typst-only and the tools it offers, Scrivener can make it so!
Perhaps we can move this to the Typst thread as we are way off topic for column sizes by now…