Nginx distribute traffic based on hostname for both http and https

I'm currently using nginx to forward ssl traffic like this:

stream {
    map $ssl_preread_server_name $name {
        host1.org host1;
        default host2;
    }

    upstream host1 {
        server host1:443;
    }

    upstream host2 {
        server host2:443;
    }

    server {
        listen *:443;
        proxy_pass $name;
        ssl_preread on;
    }
}

I would like to extend this so that HTTP traffic (port 80) is forwarded as well.

I'm not sure if this is even possible with the stream module (because the Host header needs to be inspected), or if the http module needs to be used.

In the latter case, is there a smart option on how to unify this in a way that I do not need to duplicate the hostname->target mapping?