Google has said time and time again that structured data, markup, schema, etc does not help you rank better in Google, all it does it help Google markup the search results with richer details for your snippets. So be it review stars, video thumbnails, top stories, etc – all of these are not directly ranking boosts but rather display features in the Google search results. Of course, richer displays can increase click through rates from Google and result in more traffic.
That being said, someone asked John Mueller of Google if GS1 Web Markup has a ranking benefit in Google. John responded “I’m not aware of us using that for anything.”
I’m not aware of us using that for anything.
— John â.o(â§â-½â¦)o.â (@JohnMu) November 8, 2017
The GS1 Web Markup Tool page does specifically say it “can improve your Search Engine Optimisation (SEO) strategy and increase the chances that your products will be found.” Which is not directly correct, which is why John Mueller had to debunk it.
Forum discussion at Twitter.