{
    "$defs": {
        "Foo": {
            "properties": {"bar": {"$ref": "#/$defs/SomeEnum"}},
            "required": ["bar"],
            "title": "Foo",
            "type": "object"
        },
        "SomeEnum": {"enum": ["A", "B"], "title": "SomeEnum", "type": "string"}
    },
    "properties": {"foobar": {"$ref": "#/$defs/Foo"}},
    "required": ["foobar"],
    "title": "FooBarObject",
    "type": "object"
}