A while back, the company I work for used a free trial of the Table Grid Editor. It worked exactly how we wanted it to, but when we attempted to use it in the Service Desk Portal with Jira, the table didn't render. It just didn't show up. I've been looking through some of your latest documentation and see where you've released fixes for the Service Desk, but I didn't see anything on if it's compatible with the Portal portion of Service Desk.
This feature is now available in Table Grid Next Generation for Jira Server.
You can download it from the Atlassian Marketplace.
We also plan to add this feature for Table Grid Next Generation for Jira Cloud in the future.