Nginx rewriting url for proxy passing

So I have two nginx server in a kubernetes cluster. I want that one nginx server acts as a reverse proxy for the other that serves my phpmyadmin files.

For accessing my phpmydadmin from the first server, the user has to type: https://mynginx.example/phpmyadmin From that I want my nginx server to rewrite the URI before he proxy pass with replacing /phpmyadmin by /.

I write this for now

      location                /phpmyadmin {
            rewrite           /phpmyadmin(/.*) $1 break;
            proxy_pass        https://phpmyadmin.default.svc.cluster.local:5000;
      }

But actually when it returns me 404 error and when I saw logs on nginx that serves phpmyadmin I see:

19 open() "/var/www/localhost/htdocs/phpmyadmin/phpmyadmin" failed (2: No such file or directory)

It doesn't seem to replace my /phpmyadmin by /.

All my config file is:

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

        return                  301 https://$host$request_uri;
}

server {
      listen                  443 ssl default_server;
      root                    /www;
      index                   index.html;

      ssl_certificate         /tls/tls.crt;
      ssl_certificate_key     /tls/tls.key;

      location                /phpmyadmin {
            rewrite           /phpmyadmin(/.*) $1 break;
            proxy_pass        https://phpmyadmin.default.svc.cluster.local:5000;
      }

      location                ~ /wordpress(.*) {
            return            307 $scheme://$host:5050$1;
      }
}