diff --git a/operator/builtin/output/googlecloud/proto.go b/operator/builtin/output/googlecloud/proto.go
index b9561dab7..287278d69 100644
--- a/operator/builtin/output/googlecloud/proto.go
+++ b/operator/builtin/output/googlecloud/proto.go
@@ -55,6 +55,20 @@ func toProto(v interface{}) (*structpb.Value, error) {
 		for key, value := range v {
 			fields[key] = structpb.NewStringValue(value)
 		}
+		return structpb.NewStructValue(&structpb.Struct{
+			Fields: fields,
+		}), nil
+	case map[string]map[string]string:
+		fields := map[string]*structpb.Value{}
+		for key, value := range v {
+			proto, err := toProto(value)
+			if err != nil {
+				return nil, err
+			}
+
+			fields[key] = proto
+		}
+
 		return structpb.NewStructValue(&structpb.Struct{
 			Fields: fields,
 		}), nil
diff --git a/operator/builtin/output/googlecloud/proto_test.go b/operator/builtin/output/googlecloud/proto_test.go
index 9aecf4493..91db84fd8 100644
--- a/operator/builtin/output/googlecloud/proto_test.go
+++ b/operator/builtin/output/googlecloud/proto_test.go
@@ -63,6 +63,23 @@ func TestToProto(t *testing.T) {
 				},
 			}),
 		},
+		{
+			name: "map[string]map[string]string",
+			value: map[string]map[string]string{
+				"test": {
+					"key": "value",
+				},
+			},
+			expectedValue: structpb.NewStructValue(&structpb.Struct{
+				Fields: map[string]*structpb.Value{
+					"test": structpb.NewStructValue(&structpb.Struct{
+						Fields: map[string]*structpb.Value{
+							"key": structpb.NewStringValue("value"),
+						},
+					}),
+				},
+			}),
+		},
 		{
 			name:  "interface list",
 			value: []interface{}{"value", 1},