I was curious for the same thing, so I quickly (with an agent) threw support for .rs scripts together on my fork:

https://github.com/tekacs/zeroserve/commit/b33f261615d20d55b...

It does leave me wondering about other runtimes that could be used as the go-between though, because at the point of compiling Rust, an approach like Cloudflare's Pingora (https://github.com/cloudflare/pingora) which I've tried using before... in _theory_ should be a 'nicer' solution - just historically awkward when I've tried using it the way that I'd have liked. Wish it were more library-shaped!