So i have 4 frontends that i needed to be accessed by public, but i want to specify an user friendly like example.com/lcd instead of example.com:3002. I want this for all those ports, 3001, 3000 and 3003 too. What i have now is the following example.pt.conf:

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

    server_name example.pt www.example.pt;

 location / {
        proxy_pass http://localhost:3000/;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
    }

        location /window/ {
        proxy_pass http://localhost:3001/;
        rewrite ^/window(.*) /$1 break;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
    }

     location /lcd/ {
        proxy_pass http://localhost:3002/;
        rewrite ^/lcd(.*) /$1 break;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
}
  location /machine/ {
        proxy_pass http://localhost:3003/;
        rewrite ^/machine(.*) /$1 break;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;

}
}

And a .conf for each frontend, with the same code as the following but with the diferent paths and ports:

server {

        listen 3003;
        listen [::]:3003;

        root /var/www/machine/build;
        index index.html index.htm index.nginx-debian.html;

        server_name example.pt  www.example.pt;

        location /machine/ {
            try_files $uri $uri/ /index.html =404;
        }
    }

It does not work as intended. Can someone help with this?
Thanks in advance.