Pass pydantic json schema to argument response_model

[andrader]

Is your feature request related to a problem? Please describe.
I am in a situation where I do not have access to the pydantic model itself, only the json schema of that model (from MyModel.model_json_schema()) my_json_schema_dict

Describe the solution you'd like

And I would like to be able to use

instructor_client.chat.completions.create(
    response_model=my_json_schema_dict, 
    messages=messages, 
    **create_kwargs,
)

Describe alternatives you've considered

I tried to recreate the model from the json, but pdantic does not offer a feature out of the box for that and also tried implementing it.
But from my understanding, doesn't Instructor converts the Model to a json schema under the hood to then pass it to the llm? Shouldn't/couldn't it also accept a json schema?