NCP behind Nginx Reverse Proxy?

I’m trying to switch from NCP in my IPv6 home network to using a IPv4 VPS, that’s connected to my home network using a WireGuard tunnel and running Nginx Proxy Manager as a reverse proxy.

But unfortunately I totally don’t get how I handle SSL certificates betweenNCP and Nginx Proxy Manager. Can someone please help me get this et up.

NCP is running on a Raspi 4 without Docker, while Nginx Proxy Manager is running on Doccker.