/resources/experiment.proto 

--- v24/resources/experiment.proto  2026-09-23 01:11:57.000000000 +0000
+++ v25/resources/experiment.proto  2026-09-23 01:12:01.000000000 +0000
@@ -114,6 +114,14 @@
   // preserved. This field can only be set when the experiment is being created.
   optional bool sync_enabled = 20 [(google.api.field_behavior) = IMMUTABLE];

+  // Output only. The lift measurement configuration.
+  optional string lift_measurement_config = 23 [
+    (google.api.field_behavior) = OUTPUT_ONLY,
+    (google.api.resource_reference) = {
+      type: "googleads.googleapis.com/LiftMeasurementConfig"
+    }
+  ];
+
   // The configuration of the experiment.
   oneof experiment_info {
     // Immutable. Details of the video experiment. Applies for experiment types: