This repo includes a notebook which shows how to use Mixtral to extract people's names from a text file and return the names as json.
It validates the response to be valid json using pydantic.
In my experiments so far Mixtral returns valid json in 100 % of the cases. Sometimes it also returns some prose together with the json, but this is easily filtered by something like .split('\n\n').
By the way, the text used is from this video: https://www.youtube.com/watch?v=o84GXnrHdgg.