/enums/audience_insights_dimension.proto 

--- v18/enums/audience_insights_dimension.proto 2025-08-05 14:36:08.000000000 +0000
+++ v19/enums/audience_insights_dimension.proto 2025-08-05 14:36:19.000000000 +0000
@@ -72,5 +72,8 @@

     // A gender.
     GENDER = 13;
+
+    // A YouTube video.
+    YOUTUBE_VIDEO = 14;
   }
 }