Below seems to work but I'm new to SQLAlchemy, so I don't know what kind of problems this will cause:

class Base(DeclarativeBase, MappedAsDataclass):

    @classmethod
    def __init_subclass__(cls, **kwargs):
        cls.__tablename__ = cls.__name__.lower()
        super().__init_subclass__(**kwargs)

Atleast you don't need to create with functions