Visited today without charging.
The chargers are in the underground parking, among the first few parking spaces to the left at the bottom of the ramp.
There are no barriers, and the parking is marked as reserved only for Migros customers.
Looking at the maps, there seems to be a quick access from the main road (north) but I didn't see it when driving. There's another entrance to the south. You then drive around the exterior parking and find the entrance to the underground garage. There should be a sign with an arrow right in front of you when you enter from the south, at least there would if someone didn't park a minivan right in front of it 💩
There are some conflicting informations about the opening time, I guess they recently changed them. At the bottom of the ramp there's a sign saying the parking closes 30min after the shop and the times mon-thu 19h, fri 20h, sat 18h. But on the side of the building there's a large sign saying the shop is open until 20h monday through friday. So the underground parking must also remain open until 20h30 the whole week.
There seems to be some unfinished construction work in some corners of the underground parking.