Using SQLAlchemy relationships while avoiding circular dependency with imports

I am having a problem using db.relationships. I noticed that to use relationships in my queries, each models that references another through a relationship has to be aware of that model (through imports as in my example below). All my models are in separate files, so I am afraid I will face circular dependency issues. Can any suggest to me how to overcome this constraints.

from .models.role import Role

class User(db.Model, BaseModel):
    __tablename__ = 'user'

    id = db.Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4, unique=True, nullable=False)
    first_name = db.Column(String(255), nullable=False)
    last_name = db.Column(String(255), nullable=False)
    email = db.Column(String(255), nullable=False)
    role_id = db.Column(UUID(as_uuid=True), db.ForeignKey('role.id'), nullable=False)
    
    role = db.relationship("Role", back_populates="user")
    

from .models.user import User

class Role(db.Model):
    __tablename__ = 'role'

    id = db.Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4, unique=True, nullable=False)
    name = db.Column(String(60), nullable=False)
    description = db.Column(String(255), nullable=True)

    users = db.relationship('User', back_populates='role')

In my Role class, I had defined a users relationship, but I was referring to it as user in the back_populates of the User class. I have fixed the mismatch. Here's the correct definition.

class User(db.Model):
    __tablename__ = 'user'

    id = db.Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4, unique=True, nullable=False)
    name = db.Column(String(255), nullable=False)
    role_id = db.Column(UUID(as_uuid=True), db.ForeignKey('role.id'), nullable=False)
    role = db.relationship('Role', back_populates='users')

    def serialize(self):
        return {
            'name': self.name
        }