[adrianmonk]

I wouldn't use LLMs, but if I did, I would try to get the LLM to write parser code instead.

If it can convert from one format to another, then it can generate test cases for the parser. Then hopefully it can use those to iterate on parser code until it passes the tests.

In a sense, asking it to automate the work isn't as straightforward as asking it to do the work. But if the approach does pan out, it might be easier overall since it's probably easier to deploy generated code to production (than deploying LLMs).