Marking forums thread titles, posts as rel="ugc"

We recently completed an SEO analysis, as our site traffic took a big hit with the September 2022 Google update. One of the recommendations was to mark all the thread titles and posts with rel="ugc", to designate them as user-generated content.

Have others done this? If so, how did you implement it - do you designate the entire forum as user-generated content, or do you only do portions of the forum, including it in the DIV for posts (for example)?
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