Use this config

yamlserver {
    listen 80;
    server_name yoursite.com;
    
    location / {
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header Host $host;
        proxy_pass http://host:port;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";  
    }
}

Now you can connect to websocket from outside world.

const ws = new Websocket('ws://yoursite.com')