Very nice, I believe Rust is doing something similar too which is where I initially learned of this idea of single-file shell-type scripts in other languages (with dependency management included, which is how it differs from existing ways of writing single-file scripts in e.g. scripting languages) [0].

Hopefully more languages follow suit on this pattern as it can be extremely useful for many cases, such as passing gists around, writing small programs which might otherwise be written in shell scripts, etc.

[0] https://rust-lang.github.io/rfcs/3424-cargo-script.html