Me and my team have recently done an experiment [1] that is pretty aligned with this idea. We took a complex change our colleagues wanted to make to a consensus engine and tried a workflow where Quint formal specifications would be in the middle of prompts and code, and it worked out much better than we imagined. I'm personally very excited about the opportunities for formal methods in this new era.
[1]: https://quint-lang.org/posts/llm_era