Like this:
| makeresults
| eval _raw= "\"SeqNo\":4433221,\"T_CODE\":\"ABC\",\"VALUE\":983123456,\"VALUE2\":\"0000000000\","
| rename COMMENT AS "Everything above generates sample event data; everything below is your solution."
| rex max_match=0 "(?<KEY_1>[^:\"]+)\"?:\"?(?<VAL_1>[^:\"]+)\"?,"
| eval _raw = mvzip(KEY_1, VAL_1, "=")
| kv
I named them this way for a reason; search for _KEY_1 on this page:
https://docs.splunk.com/Documentation/Splunk/latest/Data/Configureindex-timefieldextraction
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