Use iRules to query number of active connections against a node

Appreciate all the help thus far, but just curious...I've searched around and honestly can't find an answer to the original question:

Is there any way to use an iRule to query how many active connections are currently on a node using the node IP and destination port as the query value (I mean, if the same node is also listening on other ports I don't want those connections to count).

Any way to do this using iRules?