How to place LTM Virtual Servers with same IP address but different ports behind GTM?

I have two LTMs in different data centers and a single GTM with knowledge of both.

On LTM 1, I have five different Virtual Serverss that all share the same IP address but listen on different ports. Each Virtual Servers uses a different pool for load balancing. There is one FQDN associated with this IP address.

On LTM 2, I have DR instances of the abovementioned five Virtual Serverss; basically copies of the builds on LTM 1, but with all Virtual Servers sharing a different single IP address, and different members in the load balancing pools.

The usual way that I set up GTM is I build a single Wide IP with a single pool beneath it, the pool would contain two members; LTM 1 and LTM2, and global availability would be used to prefer LTM1.

I am looking for a similar way to configure GTM that can accomodate the fact that I have multiple LTM Virtual Servers listening on different ports. I was thinking of creating five different pools underneath the single Wide IP but am unsure how GTM would know which pool to use when a client requests the FQDN.

I prefer not to use iRules unless it can't be accomplished any other way, any input appreciated.