Why TCP port is required for Wide IP Pool members

How if I have 1 IP but with 2 or more TCP service ports?

When I create a GTM Wide IP Pool, I need to choose one port but this causes some problems, here's an example:

Say I have 10.1.0.100 and my LTM has port 80 and port 443. If I add 10.1.0.100 : 443 as a pool member in the GTM, then should port 80 fail - the GTM wouldn't know because the GTM is only receiving information about 443 from the LTM. And conversely, if port 443 fails - the GTM will mark 10.1.0.100 as unavailable even when port 80 is still up.

How do I get the GTM to not mark the IP as unavailable if there are still other service ports up?