How to retrieve objects from .mjs files

Hi there and thx for reading and answering this post.

I just declare a basic variable like
in a .mjs file. ( Javascript module file)

then I import the .mjs file in my C++ application with
So far so good, but before qt 4.14, I was able to retrieve x with e.g.
But now, I can't get x anymore.

Have an idea ??

Thx for answering