enumerating healthy nodes in a pool

I would like to create an iRule that directs requests to a specific, healthy, member of a server pool using HTTP redirects. I have the script (more or less) working, but it is currently relying on an internal array of server addresses.

 

 

I would prefer to have the rule pull this list from a pool object and only pull nodes which are marked as healthy. Can someone point me in the right direction?