KSQLDB Parsing delimiter data wrap in double quotes

Hi Folks,

Can helps with the issue i facing now?
Basically i have a topic that constantly getting data from a syslog connector in json Serializer. the data that i received is in below sample format:

{
    "schema": {
        "type": "struct",
        "fields": [{
                "type": "string",
                "optional": true,
                "doc": "",
                "field": "name"
            }, {
                "type": "string",
                "optional": false,
                "doc": "Type of message received",
                "field": "type"
            }, {
                "type": "string",
                "optional": true,
                "doc": "",
                "field": "message"
            }
        ],
        "optional": false,
        "name": "io.confluent.syslog.Message"
    },
    "payload": {
        "name": null,
        "type": "RFC3164",
        "message": "1,infrastructure,3,\"infra1,infra2,infra3\",dns,dns-base,1,1"
    }
}

I would like to extract message attribute from the payload using ksqldb into a delimiter format. I’d tried with below example:

CREATE OR REPLACE STREAM txn_stream WITH(
	KAFKA_TOPIC='txn.topic', FORMAT='DELIMITED', PARTITIONS=3, REPLICAS=3, VALUE_DELIMITER=','
)
AS 
SELECT 
SELECT 
SPLIT(EXTRACTJSONFIELD(DATA, '$.payload.message'), ',') [1] col1
, SPLIT(EXTRACTJSONFIELD(DATA, '$.payload.message'), ',') [2] col2
, SPLIT(EXTRACTJSONFIELD(DATA, '$.payload.message'), ',') [3] col3
, SPLIT(EXTRACTJSONFIELD(DATA, '$.payload.message'), ',') [4] col4
....................................
from source_topic;

Unfortunately above methods still interpret comma within the double quotes which is not what my objective. My expected output would be similar as per below:

1,infrastructure,3,"infra1,infra2,infra3",dns,dns-base,1,1
2,infrastructure,5,"infra1,infra2",dns,dns-base,7,2

Can please advice is this achievable via ksqldb alone?
Appreciate any response.

Thanks.
Kenny.