ydb/yt/yql/tests/sql/suites/json/example.txt.attr

{
    "_yql_row_spec" = {
        "Type" = [
            "StructType";
            [
                [
                    "K";
                    [
                        "DataType";
                        "Int64"
                    ]
                ];
                [
                    "J";
                    [
                        "DataType";
                        "Json"
                    ]
                ]
            ]
        ]
    }
}