Hello @Ganesh Navale,
Can you please provide more details on the name/type of gadget that you are referring to here? If it's something out-of-the-box from Jira, you should be able to view it in the gadgets list and if it comes from a plug-in, the plug-in needs to be installed in your Jira instance for it to be available.
Looking forward to hearing from you!
I checked the list provided :- https://support.atlassian.com/jira-cloud-administration/docs/use-dashboard-gadgets/
But I found few gadget missing like 'Agile Wallboard' which was available earlier.
Why all the gadget are not made available with Jira license by default?