Visited on Monday without charging.
The charger is in front of the garage. There's a green parking half-spot and a sign "Ladestation for Elektrofahrzeuge", though that's technically not signage for "only charging", so no idea whether it's kept free. Next to the charger there's a second small sign with payment instructions and QR code.
There's a second green EV sign on the pillar of the gas station roof on the left. It's a bit strange to put it there, because it's so small. If you spot it from the main road, chances are you also see the charger and the sign above the charger.