LFortran author here. There is a Python prototype version that you can see in the notebook and it has very limited support for arrays. I stopped spending more time on it once I got further enough to validate that the idea works. And I am now spending all my time on the production LFortran implementation in C++. I am very close to make it usable for some very simple things, and then we'll go from there.

Not sure about arrays (I am not involved in the project, I just thought it was cool). It’s still in a very preliminary stage, though, so there certainly are rough edges.