It looks like there isn't a direct way to create a completely custom Copilot for Atlassian Jira and Confluence integration, there are copilot for confluence and Jira on Atlassian marketplace if you would like to use!
Also, Atlassian Forge provides tools and APIs for developers to build custom integrations with Atlassian products like Jira and Confluence. While it wouldn't directly integrate Copilot, you could create an add-on that interacts with Jira/Confluence data and offers functionalities like a Copilot.
I hope this helps!
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Thanks
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