Seconded, I wish for a way to work with ML models using native code rather than through some Python scripting interface. I believe TensorFlow is there with C++, but it works only with C++ and not through FFI.
PyTorch has libtorch as its purely native library. There are also Rust bindings for libtorch:
https://github.com/LaurentMazare/tch-rs
I used this in the past to make a transformer-based syntax annotator. Fully in Rust, no Python required: