How do I load a managed assembly into a shared object written in C for unix/linux?

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C

C#

Linux

unmanaged

managed

I need to dynamically load a .NET managed assembly into a Unix/Linux shared object that itself exports four functions is C.

What I have tried:

I have an existing code base written in C# for .NET 5/Core 3 that I need to dynamically load into a shared object written in C running on Linux/Unix, and I can't find any information as to how that can be done.

There is no end of tutorials explaining how to load a native C library into a C# assembly (unmanaged to managed), and of course I can use C++/CLI to dynamically load a managed .NET assembly (managed to unmanaged) if running in Windows, but C++/CLI is not part of .NET Standard and so isn't an option when running in Linux/Unix.

I presume crossing the barrier from managed to unmanaged code in Linux/Unix is a problem that has already been solved, but if so, I can't find the solution.