@naeem For a sensible answer, I need to know more information. Which JSON file is it and what is it for?
JSON file is easy to create, just click "Write to file", for example, with the name "my_file.json". You can find the content (syntax) of JSON here: https://developer.mozilla.org/en-US/docs/Learn/JavaScript/Objects/JSON
Can I install VPN on chrome browser instead of using proxy?
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Yes, you can install the VPN extension in BAS.
https://wiki.bablosoft.com/doku.php?id=using_extensions