I want to create rule to allow traffic on Custom port.
Use one of the edge ports supported by Cloudflare:
Network ports · Cloudflare Fundamentals docs
Have a subdomain on the usual ports and have Cloudflare connect to a custom port on your origin using origin rules:
Available Origin Rules settings · Cloudflare Rules docs
Use Spectrum (requires Enterprise account and is an add-on):
Protocols per plan · Cloudflare Spectrum docs
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