Support for JSON outputs

[geoffroy-noel-ddh]

Ollama 0.5 now support outputs constrained to JSON according to a user defined schema.

We could try to integrate this. Possibly by extending the format of the question so the user can pass an output schema.

I'm not sure how we could generalise this to other describers than Ollama. (At the very least BVQA could validate the JSON output, in terms of well-formedness and content).

And whether all models will play well with this constraint. Presumably if a model hasn't been trained to produce JSON, this new feature won't magically produce that out of a generated paragraph.

[geoffroy-noel-ddh]

When the question contains 'json' and the response is valid json, it will be stored in json in the answer file, rather than a string.

[geoffroy-noel-ddh]

• Also need to change report, so it works with non-string answers
• support for various types of json output formats, some models like qwen will often wrap the json in a code block