The best way to do this is to create a Rust library with external functions and then use the Foreign Function Interface to load and execute these functions:

https://reference.wolfram.com/language/guide/ForeignFunctionInterface.html

For example if you have this Rust code (add.rs):

use std::os::raw::{c_int};

#[no_mangle]
pub extern "C" fn add(a: c_int, b: c_int) -> c_int {
    a + b
}

And build it with Cargo, then you will get an add.dylib library, which you can load in Wolfram Language:

add = ForeignFunctionLoad[ "add.dylib", "add", {"Integer64", "Integer64"} -> "Integer64"]

Now you can call this function from the Wolfram Language:

add[4,5]

Hope that helps.

Feature requests should be submitted to:

http://www.wolfram.com/support/contact/email/?topic=Feedback