Parsing chess PGN move tree, including variation -- 4

I need something simple parsing done with python-chess ([login to view URL]) Here's the scope, given a PGN file, which can contain many PGN entries, for each of the entry, I need to generate a JSON file of the move tree, including variation. I have attached one example for a single PGN and the sample output JSON. I have attached the original PHP script as well as a work in progress python script.