I visited this location on foot in January 2022 but didn't find any hint of where the chargers could be. There was a ramp but I don't remember seeing any sign of public parking. There was no obvious foot entrance for a parking. At the time I don't think there were any pictures on Chargemap.
A picture has now been added, showing 2 spots with EV logo in an underground parking, numbers 25 and 26. The chargers are the older model with ewb orange branding.
The building is visible on the map on the hospital website https://www.insel.ch/de/patienten-und-besucher/ihr-aufenthalt/anreise but there is no parking sign on it.
It seems like you can rent space in that building https://sitem-insel.ch/en/what-we-offer/services/services-for-rent but they don't mention parking on that website either.