How to create subdomain pointing to a different port number?

In my use case I would like to create a sub domain with the main domain's IP address but with different port number. For example,

I have the the main domain as abc.com pointing to 192.168.1.1

@                    192.168.1.1

I would like to create to a subdomain with port 8081

api.abc.com          192.168.1.1:8081

I tried to create a SRV record with the following information,

Name: api
Target: api.abc.com
Protocol: _http
Service: _http
Priority: 5
Weight: 5
Port: 8081
TTL: 1 hour

But this didn't help. I am using Godaddy to manage my domains.

Could someone help me with this?

Thanks.