/resources/asset_group.proto 

--- v24/resources/asset_group.proto 2026-09-23 01:11:57.000000000 +0000
+++ v25/resources/asset_group.proto 2026-09-23 01:12:02.000000000 +0000
@@ -116,6 +117,18 @@

   // Local services info of the asset group.
   GoogleLocalServicesInfo google_local_services_info = 14;
+
+  // URL template for constructing a tracking URL.
+  string tracking_url_template = 15;
+
+  // A list of mappings to be used for substituting URL custom parameter tags in
+  // the `tracking_url_template`, `final_urls`, and/or `final_mobile_urls`.
+  repeated google.ads.googleads.v25.common.CustomParameter
+      url_custom_parameters = 16;
+
+  // URL template for appending params to landing page URLs served with parallel
+  // tracking.
+  string final_url_suffix = 17;
 }

 // Information about the asset coverage of an asset group.