After having toyed with it for a couple more days, I noticed it sometimes returns malformed JSON with extra tokens. E.g.

  {"name": "foo", "company": "bar"}</code>

That's the only weird response I've seen so far, so I just work around it with regex. But if I start seeing other problems with the completion I might try tuning the prompt. Maybe more explicitly telling it how to format the two pieces of data in the output. Got that idea from here: https://twitter.com/goodside/status/1559801520773898240