The recent Software Engineering Daily podcast on "Unity and WebAssembly" mentions that Unity has a .NET to C++ toolchain. Is that some kind of stock Mono featur

The recent Software Engineering Daily podcast on "Unity and WebAssembly" mentions that Unity has a .NET to C++ toolchain. Is that some kind of stock Mono feature, or is that another .NET runtime? https://www.softwaredaily.com/post/5ba9fdd63e3767000494fe01/Unity-and-WebAssembly-with-Brett-Bibby https://www.softwaredaily.com/post/5ba9fdd63e3767000494fe01/...