Using the Custom Content Gadget within Confluence
You can use our Custom Content gadget within your Confluence instance.
All you have to do is follow the guide provided by Atlassian: https://confluence.atlassian.com/doc/registering-external-gadgets-204050482.html
The application link must use “OAuth (Impersonation)”.
Configure an application link between your Confluence instance and your Jira instance: https://confluence.atlassian.com/doc/linking-to-another-application-360677690.html
Add the Custom Content gadget as an external gadget in Confluence.
Once configured, you will be able to add a Custom Content gadget as a macro on any Confluence page.