I don't know for sure but I would think that the BMS in the Soul will heat the battery while charging in cold temps...that's what happens on the RAV4EV. I'm in Rochester NY and keep the car outside during the day. A 110 charger will keep the battery warm and add a little charge but the benefit...
I have a RAV4EV in Rochester, NY. Two winters of data (about 36k miles total). It's not identical because it has the resistance heater...but our GOM range shows about 2/3rds in the middle of winter. The car starts in the garage but spends it's day outside.
You will have better results with...
It seems that all EVs are always delayed in their rollout. Maybe there is an exception but that was the case for the Teslas, Rav4ev and i3.
I'm in NY too (Webster) so I'll be interested to see when they get here.
Mike