Cross database join in sqlalchemy

Is there a way in SQLAlchemy to do cross-database joins. To be specific, here is my use case:

Schema

1. db1.entity1
   1. entity1_id: Primary Key
   2. entity2_id: Foreign Key to db2.entity2.entity2_id
2. db2.entity2
   1. entity2_id: Primary Key

Model

I'm using declarative style for models.

class Entity1(Base):
  __tablename__ = 'entity1' ## I tried combination of <db>.<table> with no success
  entity1_id = Column(Integer, primary_key=True)
  entity2_id = Column(Integer, ForeignKey('db2.entity2.entity2_id'))
  entity2 = relationship('Entity2')

class Entity2(Base):
  __tablename__ = 'entity2' ## I tried combination of <db>.<table> with no success
  entity2_id = Column(Integer, primary_key=True)

Now, as expected, my queries for Entity1 is failing with MySQL error messages saying table entity2 not found. I tried many different combination for __tablename__ with no success. So i was wondering if it is possible in SQLAlchemy.