/common/audience_insights_attribute.proto 

--- v22/common/audience_insights_attribute.proto    2026-06-19 00:56:07.000000000 +0000
+++ v23/common/audience_insights_attribute.proto    2026-06-19 00:56:11.000000000 +0000
@@ -262,3 +262,13 @@
   // Attributes with metadata returned in response to a search.
   repeated AudienceInsightsAttributeMetadata attributes = 1;
 }
+
+// A list of AudienceInsightsAttributes.
+message InsightsAudienceAttributeGroup {
+  // Required. A collection of audience attributes combined with logical OR.
+  // Attributes need not all be the same dimension. Only Knowledge Graph
+  // entities, Product & Service Categories, and user interests are supported in
+  // this context.
+  repeated AudienceInsightsAttribute attributes = 1
+      [(google.api.field_behavior) = REQUIRED];
+}