Bar chart for dashboard 2.0

How to make 7 days bar-chart in node-red dashboard 2.0.

Welcome to the forum @tsharma

It's not so hard.

How much have you managed to achieve by yourself before asking for help?
Do you have Node-red running?
Have you installed the dashboard?
Where does your 7 days data come from?
Have you managed to get the data into Node-red?

You should watch the recommended tutorials