I am not really sure what does “wrapped with JUCE” mean?
Is it maybe about running a web page in a browser and sending requests and receiving replies from a JUCE based server application?
Is it a JUCE application that has a JUCE WebBrowserComponent and somehow communicating with the C++ side? (It would be similar to the possibility above, the WebBrowserComponent can’t do direct communication with the C++ code, it’s just an embedded web browser view provided by the operating system.)
So, there’s a lot of options what the thing could even be about, and it’s not at all clear from your post.