Cloudflare says in their article
By default, Cloudflare proxies traffic destined for the HTTP/HTTPS ports listed below.
HTTP ports supported by Cloudflare:
but at the bottom of this page Cloudflare also says this:
Cloudflare Access does not support port numbers in URLs. Port numbers are stripped from requests for URLs protected through Cloudflare Access.
So i dont get it, but how do I use one of these other ports? aside from 80 for http or 443 for https (obviously)