I don't think there's anything precluding Go from making it possible, other than the maintainers' desire to not have macros. Rust gives you the power here, and as a result has some tremendous serialization libs:

https://github.com/serde-rs/serde

Macros don't need to be as simple to use as in lisps to be useful - the rare library like serialization that can really benefit from them can be worth the language feature