Earlier quoted context omitted.
There's nothing to switch to. You just enable it. No need to change the prompt or anything else. All it requires is that you mention "JSON" in your prompt, which you obviously already do.
I think that’s only true when using ChatGPT via the web/app, not when used via API as they likely are. Happy to be corrected however.
https://platform.openai.com/docs/guides/text-generation/json...