Typst is a new markup language and I've noticed that pygments doesn't support it.

The syntax documentation can be found here:
https://typst.app/docs/reference/syntax/

For comparison, somebody has already implemented a grammar definition for Github Linguist:
https://github.com/michidk/typst-grammar/blob/master/grammars/tmlanguage.json