Homebrew nginx (Valet version) with custom config:

valet_nginx_custom_config.md

In /usr/local/etc/nginx/nginx.conf (default config), Valet has included these lines:

# ...

    include "/Users/sten/.config/valet/Nginx/*";
    include servers/*; # 👈
    include valet/valet.conf;

# ...

so:

mkdir -p /usr/local/share/nginx
cd /usr/local/share/nginx
ln -sfv /usr/local/var/www html

mkdir -p /usr/local/etc/nginx/servers
cd /usr/local/etc/nginx/servers
touch static 3030to3000

/usr/local/etc/nginx/servers/3030to3000:

server {
  listen 3030;
  server_name localhost;

  location / {
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header Host $http_host;
    proxy_pass http://127.0.0.1:3000;
  }
}