Unfortunately, we do not have a gadget for Confluence. There is a workaround to display reports in Confluence:
Publish the report (how to publish?)
Embed the published URL in a Confluence iframe
To enable iframe in confluence, please find the instructions below:
https://confluence.atlassian.com/confkb/how-to-put-an-iframe-into-confluence-598837531.html
orhttps://confluence.atlassian.com/confcloud/iframe-macro-950276528.html
Setup automatic refresh of the published view as per the instructions here: How to refresh a published report automatically?