This location is visible on the "old" map from Migros website with 4 plugs.
Unfortunately I don't know if this map was updated after the July 2022 when the M-CHARGE pilot program was started.
On Chargemap and GoingElectric there are plugs in this parking but it's named after the airport and not Migros, and there are only 2x blue camping and 1x T13 so it doesn't match with the 4 plugs. Not sure if these camping plugs are still there today.