Question about reverse proxy

Currently i have working with NGINX reverse proxy for a few subdomains and wanted to move to SWAG,
Currently testing it out but im a bit confused, from what i read on the wiki was to remove the .sample and leave .conf but didnt find where to put the servername in my case it would be
This is what i got so far
went to /swag/nginx/site-conf/default

and edit a example block to this

server {
    listen 443 ssl http2;
    listen [::]:443 ssl http2;
#    root /config/www;
#    index index.html index.htm index.php;
    server_name admin.*;
    include /config/nginx/ssl.conf;
#    include /config/nginx/authelia-server.conf;
    client_max_body_size 0;

    location / {
#        # the next line will enable Authelia along with the included authelia-server.conf in the server block
#        include /config/nginx/authelia-location.conf;

#        include /config/nginx/proxy.conf;
#        resolver valid=30s;
        set $upstream_app;
        set $upstream_port 8024;
        set $upstream_proto http;
        proxy_pass $upstream_proto://$upstream_app:$upstream_port;

im trying to reverse proxy a wordpress which has an ip of and port 8024

Thank you