I would like to create an Eisenhower Matrix in Confluence / JIRA.
I taught found a practical solution on the ATLASSIAN Community :
but unfortunately when I put it in place I cannot find a Filter Result Gadget in Confluence.
Is anyone aware of how to filter a list of tickets inside a table in Confluence?

You can use this guide to accomplish this.
https://confluence.atlassian.com/jira064/adding-the-filter-results-gadget-720416922.html
The "add gadget" button: