How to config ngnix to use websockets at subscriptions location on server

.ngnix.config

server {
        listen 80;
        listen [::]:80;

        server_name graphql.mydomain.com.br;

        location / {
                proxy_pass http://mydomain:8080;
        }
        
        location /subscriptions {
                proxy_pass http://mydomain:8080;
                proxy_http_version 1.1;
                proxy_set_header Upgrade websocket;
                proxy_set_header Connection Upgrade;
        }
}