How to specify a port number for the meshcat-server?

[Yam0214]

How can I specify a port number for the meshcat-server? I checked the help options, but there's nothing mentioned about setting the port.

meshcat-server --h                
usage: meshcat-server [-h] [--zmq-url [ZMQ_URL]] [--open] [--certfile CERTFILE] [--keyfile KEYFILE] [--ngrok_http_tunnel]

Serve the MeshCat HTML files and listen for ZeroMQ commands

optional arguments:
  -h, --help            show this help message and exit
  --zmq-url [ZMQ_URL], -z [ZMQ_URL]
  --open, -o
  --certfile CERTFILE
  --keyfile KEYFILE
  --ngrok_http_tunnel   ngrok is a service for creating a public URL from your local machine, which is very useful if you would
                        like to make your meshcat server public.