SQLModel: how to load specific columns?

Question

I tried to load specific columns from a table via the following method:

from sqlalchemy.orm import load_only
from sqlmodel import (Field, Session, SQLModel, create_engine, select)
from models import ( Tx )

engine = create_engine(url, echo=True)

        with Session(engine) as session:
            results = session.exec(select(Tx.Id, Tx.party, Tx.time)
                                   .order_by(Tx
                                             .time
                                             .desc())
                                   ).all()

            myResults = []
            
            for result in results:
                myResults.append(result.toDict())

However returns Row class which then I can't run toDict() since normally I get back Tx class that has that method. Hope it is clear what I want here, I did not expect Row class.

So then I try using the sqlalchemy method, however, this does not seem to work well, as it returns ALL columns, regardless of what I filter for:

from sqlalchemy.orm import load_only
from sqlmodel import (Field, Session, SQLModel, create_engine, select)
from models import ( Tx )

engine = create_engine(url, echo=True)

        with Session(engine) as session:
            results = session.exec(select(Tx)
                                   .options(load_only("id", "party", "time")))
                                   .order_by(Tx
                                             .time
                                             .desc())
                                   ).all()
            myResults = []
            
            for result in results:
                myResults.append(result.toDict())