Hello,
nice to know I’m not alone 
I had posted on Github issue, and posted here as well because I hadn’t found your post while searching for this…
My take is that choc::Value would need to be updated to support functions. Otherwise, a lot needs to be done in to work around it and the data flow would not be as elegant and consistent as now
Link to the other post :
(JUCE 8) QuickJS implementation missing methods - General JUCE discussion - JUCE