Are you trying to actually develop your own gadget for use, or did you simply want to insert an existing Confluence gadget on your Jira Cloud?
If you want to add Confluence gadgets to your Jira instance, you can let me know your Cloud URL and I can make sure it's enabled for you.
Thank you for clarifying.
Unfortunately I don't have any experience writing gadgets but you will find some information on our Developer documentation:
If you get stuck, you can try some of the Developer Help Resources listed on that site.
Let us know if you have any questions!
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