This feature is mentioned in the Mx 10.10 release blog: https://www.mendix.com/blog/mendix-release-10-10-features-sprinkled-across-the-platform/
Not much that is said there however, in most cases the watch function will provide updates on changes on an item, so I expect this to be the same case with feedback items you are watching.
Thanks Erwin. I did see this article, but it's not very specific. I guess it just adds notifications for the individual item. Thank you.