Question Mono interop for Native Plugin

Hello,

I have been recently trying to build a native plugin for Unity and I came across this thread:
https://forum.unity.com/threads/pinvoke-mono_add_internal_call-c-and-c.172886/

And I would like to know if it is indeed possible to use Mono Interop with Unity in this way, using mono_add_internal_call.

I have tried building a DLL linked to a mono library, but Unity is not able to load the plugin. I know that Unity uses its own implementation of Mono-Runtime, but is there a way to link that to the DLL when building?