How can I add a port to my A record?
Greetings,
Thank you for asking.
I am afraid this is not possible in the DNS tab of CF dashboard 
You cannot specify a specific port in the DNS records.
Otherwise, may I ask if you’re thinking about adding a SRV type of the DNS record(s)?
Your web application/service can run on some port which you could access via the scheme ip:port or hostname:port in your Web browser.
May I ask which one do you need?
Currently, the ones which are compatible and supported with Cloudflare proxied 
are listed on the link from below:
If you need to run your web app on some specific, either switch the DNS hostname to unproxied 
(DNS-only), otherwise you can try out by using Cloudflare Spectrum, if so:
You can do a Destination Port Override but it’s currently in beta and can only be done via the API.
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