How can I build Rust code with a C++/Qt/CMake project?

I have an existing C++/Qt project built with CMake. I'd like to start adding Rust code which I can invoke from inside the main C++ codebase.

What's the right way to structure the project?

Current project structure:

./CMakeLists.txt
./subproject-foo/CMakeLists.txt
./subproject-foo/src/...
./subproject-bar/CmakeLists.txt
./subproject-bar/src/...
./common/CMakeLists.txt
./common/src/...

I'd like to add a common-rust/... directory with similar structure.

How can I incorporate this into the project?