Using bson.ObjectId in Pydantic v2

I found some examples on how to use ObjectId within BaseModel classes. Basically, this can be achieved by creating a Pydantic-friendly class as follows:

class PyObjectId(ObjectId):    @classmethod    def __get_validators__(cls):        yield cls.validate    @classmethod    def validate(cls, v):        if not ObjectId.is_valid(v):            raise ValueError("Invalid objectid")        return ObjectId(v)    @classmethod    def __modify_schema__(cls, field_schema):        field_schema.update(type="string")

However, this seems to be for Pydantic v1, as this mechanism has been superseeded by the __get_pydantic_core_schema__ classmethod. However, I have been unable to achieve an equivalent solution with Pydantic v2. Is it possible? What validators do I need? I tried to refactor things but was unable to get anything usable.