It appears that only 3 pages using the markup will display the treatment in search results. This also appears to be restricted to the 1st page of Google. So if using the markup and ranking on the 2nd page, it’s unlikely you’ll receive the SERP treatment.
- How-To Schema Rich Results Coming to Desktop May 27, 2020
- Google My Business COVID-19 Donation & Gift Card Links Now Rolling Out May 22, 2020
- Structured Data Not Supported for Unpaid Listings in Google Shopping Tab May 16, 2020
- Some Featured Snippet URLs May Still Repeat in Search Results April 10, 2020