Hi Balaji,
There was an Atlassian Labs add-on in earlier versions, however, I no longer see it and the only references to the burndown chart we have are in the JIRA 6.x documentation.
There are some add-ons that you can use such as Agile Reports for Jira or if you're on Cloud you can try Great Gadgets for Jira Cloud.
Cheers,
Branden
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