B4J Question C++ and B4J

I have come across a need for C++ code. I am looking back at a library generator @wonder was working on: https://www.b4x.com/android/forum/threads/native-library-generator-c-c-to-b4a.62163/page-5#posts
Does something like this exist for B4J? I have seen where people are using JNI to do this, I am not familiar with this process, how difficult is it to implement?

Any ideas?

Thanks as always!