I have read https://confluence.atlassian.com/confkb/how-to-bring-jira-and-jira-agile-reports-into-confluence-779163801.html but do not see the External Gadget item in Step 3, sub-item 2.
The document that you are referring to is for Data Center/ Server version of Confluence and is not applicable for Confluence Cloud.
Please check the following document to check the integration capabilities between Confluence and Jira cloud: https://confluence.atlassian.com/doc/use-jira-applications-and-confluence-together-427623543.html
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