Typst html support is already available as an experimental feature, so e.g. EPUB probably isn't too much work in addition to that (as I understand it, it's basically zipped HTML with some metadata). It's also in the roadmap: https://typst.app/docs/roadmap/#:~:text=EPUB%20export .

If the translator has access to a service like typst.app, then I don't see too many obstacles for translating. But I don't have any experience on doing translations.