SQLAlchemy: modify value on attribute set

Question

I have a following model:

class Place(Base):
    __tablename__ = 'places'

    id: Mapped[BigIntPk]
    name: Mapped['str'] = mapped_column(
        String(128, collation=RU_RU_CE_COLLATION_NAME),
    )
    address: Mapped['str'] = mapped_column(
        String(256, collation=RU_RU_CE_COLLATION_NAME),
    )
    region_name: Mapped[BigIntType] = mapped_column(
        ForeignKey('regions.name', ondelete='RESTRICT', onupdate='CASCADE',),
    )
    coordinates = mapped_column(
        Geography(geometry_type='POINT', nullable=True, spatial_index=False),
    )

    strikes: Mapped[list['Strike']] = relationship(
        secondary='strike_to_place_associations',
        passive_deletes=True,
        back_populates='places',
    )
    region: Mapped['Region'] = relationship()

Thing is unlike with all other attributes whenever i need to set coordinates and sucessfully save model instance in database later i need to assign this exact attribute as :

from geoalchemy2 import WKTElement
coordinates = WKTElement(f'POINT({lat} {lon})')

instead of assigning coordinates in more usual format as tuple of lat, lon (22.8, 33.3) for example.

Question is - is it possible to assign coordinates attribute with bare tuple of (lat, lon) and then mutate it on assign or before save in database as it specified above?

I sort of found how to do it via events but it is quite hidenn away and implicit -> i dont like it this way....