ADD json2chart Plugin

[lfenghx]

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[lfenghx]

Hi team! Just wanted to gently follow up on this PR for the JSON-to-chart plugin—it lets users automatically convert standard JSON data into interactive visual charts via an AI model.
I’ve double-checked the code and it’s ready for review whenever you have a moment. Let me know if there’s any additional info or adjustments you need from me!
Thanks so much for your time 😊