To see the volume of Nifty and Banknifty indices we often refer to their Futures chart. With the help of this script, you can directly plot the volume of Nifty Futures over the Nifty chart and Bank Nifty Futures over the Bank Nifty chart.
If the scrip entered is other than Nifty or Bank Nifty it will plot the default volume of that scrip.