Self signed SSL

Hello everyone,
I just don’t know what to do anymore. I have been trying to install Vaultwarden on my Proxmox 7.x host for some time. I have created a Debian11 container with Docker Compose and installed Vaultwarden. When I call the local IP address of the host, I also get to the Vaultwarden WEBGUI. Now I want to install a local self-signed SSL certificate, which I created with my local CA. My question is, where do I save this and where do I specify the path? I can’t use a reverse proxy because of DS-Lite and I don’t want Cloudflare. I would really appreciate detailed instructions or a tip. Thank you.

Unfortunately, the following instructions do not help me: