It would be perfect if I cuold simply show the Smartsheet information inside of Confluence. No need for further fancy Jira/Confluence integration which I know costs a lot of money.
You can publish sheets, report or dashbord and then include them into an inframe inside confluence
How to publish :https://help.smartsheet.com/articles/522078-publishing-smartsheet-items
How to iinclude iframe https://confluence.atlassian.com/confkb/how-to-put-an-iframe-into-confluence-598837531.html