Use GTM wide IP to balance DNS records

I am missing something very simple, I think.  I am looking to have my GTM listener for DNS requests take in a request for an A record and response with one of two possible IPs based on a health check on if they respond to ping, combined with a ratio.  It will only respond with 1 of 2, never both.  Those IPs will NOT be part of an LTM virtual server, just  remote IPs.  I cannot seem to find the right way to get this to work. Any tips?  Thanks!