Hello Shiva,
If you were using the Confluence server you could follow the steps below:
<span class="nolink"><a href="http://example.com/jira" rel="nofollow noopener noreferrer">http://example.com/jira</a></span>
<span class="nolink"><a href="http://example.com/confluence" rel="nofollow noopener noreferrer">http://example.com/confluence</a></span>
Page: https://confluence.atlassian.com/display/DOC/Registering+External+Gadgets
But if you are using Confluence cloud please open a issue for this request with our support team.
Cheers,
Henrique Freitas
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