1. I need to add external gadget to jira for use.
2. Especialy gadget which I put on dashboard, that show the log activity in hours (If there is any build-in gadget in jira software in cloud, I would like to know).
It's not possible to use external gadgets in Jira Cloud anymore since it's a restricted function.
If you're referring to the worklogs, it seems that Timesheet Reports and Gadgets might work for you:
Project Pivot and Time Sheet gadgets show worked hours right on Jira or Confluence dashboard.
You can give that a try and let us know if you have any trouble!
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