This location is listed on Chargemap. The pictures show 5 Mennekes chargers in an underground parking, with each a green parking spot. There are cables attached to the wall that don't seem permanently tethered to the chargers, so it's possible to charge with a different cable (T1) as well.
The website for the hotel https://www.bocken.ch/en/about-us/location-direction says there is free parking but doesn't mention the chargers.