It appears that Google is starting to use search results to highlight what games are available on Stadia. When searching for F1 2020 it shows available now on Google Stadia.
This appears to be a new and does not show up in all places. It might be only available on mobile for the time being. To find this you need search for F1 2020 on mobile. Then click for the video game option it shows now available on Google Stadia. Or alternatively it can be found be selecting F1 2020 video game in the auto search function.
This is interesting development as Google may be using there position of strength in search to help Stadia going forward. This along with the dominance of YouTube gives Google some opportunities to push Stadia in the future.