Sometimes watching a video on YouTube may not be enough to satisfy your curiosity. Therefore, users like me often start the web browser to learn more about a specific topic. Google apparently wants to eliminate the effort when switching between apps and displays the Google search results next to the relevant videos for your query in the YouTube app on Android.
First discovered by a user on Reddit, we tried to replicate the new function and it worked. When you search for a keyword in the YouTube app, you'll see a line between the video recommendations titled "Score from the web". You can either click the search result to open the website directly without leaving the YouTube app, or you can tap the Search "button (your search terms)" on Google below.
However, it appears that the test is conducted among a limited number of users because Google Search in-app results are not shown to everyone. We also found that when you search for a guide or tutorial video, the result of Google search in the YouTube app is mostly shown. Google has not yet officially detailed its new feature, so we may have to wait a bit to learn more about it.