Use custom node names (iApp f5.http)?

The iApp f5.http uses the IP-address as the node name. However, our naming convention requires the following syntax:

    appname_serverhostname

From what I can tell the iApp uses the namespace

pool_members

to create the nodes:

    [iapp::pool_members $::pool__members]]

I've tried the

-fields

flag to specify the node name (

node_name

), but so far I'm not having any luck.