Information About Using Load Balancer with SSL and nginx

We are currently configuring load balancer and nginx settings.
The configuration is a load balancer, from which it is assigned to the nginx server, and from the nginx server to the real server.
Because SSL certificates are installed on the load balancer, the nginx and real servers are not supposed to be SSLized.
In this case, how do I configure the nginx server to sort https (port443)?
Do I also need to install SSL certificates on my nginx server?

In nginx.conf of nginx, I couldn't just specify:

server{
    listen443;
    server_name localhost;
}

Thank you for your cooperation.