_a: str
    field_b: bool

json_schema = core_schema.json_schema(schema=dict_schema)
schema = core_schema.model_schema(cls=MyModel, schema=json_schema)
v = SchemaValidator(schema)
m = v.validate_python('{"field_a": "hello", "field_b": true}')
assert isinstance(m, MyModel)
```

Args:
    schema: The schema to use for the JSON schema
    ref: optional unique identifier of the schema, used to reference the schema in other places
    metadata: Any other information you want to include with the schema, not used by pydantic-core
    serialization: Custom serialization schema
