If your intention is to convert directly the JSON then that baeldung solution that you were given is good.
Otherwise, the way i see it and based on the info you're giving, you will need to have a representation of that JSON in a java object that will either represent some kind of request coming from somewhere or data you're getting from your database in order to be written on a csv.
Check out these, might be useful: https://www.codejava.net/frameworks/spring-boot/csv-export-example
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