Visited yesterday without charging.
It's indeed a Migros, and it's brand new.
When driving down the ramp into the parking, there's a big sign saying the Migros parking is to the left (right is probably for the apartments). The sign includes an EV symbol, so it's very clear where you need to go.
The chargers are the first 5 spots on the right after entering the parking, so it's easy to find them. They are the farthest you can be from the foot entrance, which is probably a good thing as there is really no reason to ICE the chargers.
The parking closes with the shops. There's 1h of free parking. Toilets are on the ground floor.