WAL2 json plugin -test_decoding not providing correct formatted results... we want to parse these wal event using java code

WAL2 json plugin -test_decoding not providing correct formatted results... we want to parse these wal event using java code.

some example of WAL event

table public.t1:UPDATE: old-key: id[bigint]:3 name[character varying]:'" value of single quote  ''"'

We are using example

https://jdbc.postgresql.org/documentation/head/replication.html#physical-replication

Can we modify format of test_decoding plugin output to get more details ?