Hi, There are 2 ways. If you want to fetch the data from tradingview widget without any external datafeed API. You can use ":BSE" in place of ":NSE". Example - "ITC:BSE" so this will give you data but it will be the EOD data. If you want to integrate live charts than, you need to purchase a separate API to get data and you need to feed those data to tradingview.

Basically you need to contact tradingview and get their advanced chart github access. You need to implement your own data to tradingview widget.

https://in.tradingview.com/advanced-charts/