SQLAlchemy check that column entry is in list when inserting

Question

I want to specify a column in my sqlalchemy model to only accept values that are in a predefined list (in the example below ['bar','baz']. Below is a minimal example of what such a model would look like

class Foo(db.Model):
    """Example Model"""

    # simple autoincrement primary key
    id: int = db.Column(db.Integer, primary_key=True, autoincrement=True)

    # this column should be constrained to ['bar', 'baz']
    exclusive_str: str = db.Column(db.String, nullable=False)

I found the check constraint in the official documentation, but the examples listed are super simple and don't seem to cover a use case like the above. How do I go about solving this?