DNS forward with other port

Good afternoon ,

I would like to have a domain name forwarded through a proxy to an IP with a different port.

example:

https://application.domainname.com (SSL 443) resolves to x.x.x.x:9000

important is that port 9000 is not designated in the “open” domain name.

Through what can we achieve this? Does this have to be done via Spectrum or what is required for this?

Sincerely

You can use an Origin Rule to override the destination port.