A “hidden feature” of pandoc, because it's not mentioned in the manual: Typst properties. E.g., use this Markdown to get very large text:
{typst:text:size=48pt}
Isn't this great?
:::
All text properties can be modified this way, and block properties can be set with `typst:property`.
The full docs are here: https://pandoc.org/typst-property-output.html