sounds like a little scripting project to me . Take output from "symaccess -sid 123 list devinfo -ig ig_name" and loop through devices capturing their pool assignment.

you want to see all devices masked to an initiator group and filter output where only thin devices are listed ?

I'd like to see all devices masked to an initiator group and in the output, an additional field is presented that includes the Pool Name.  Our pools are named after Tiers - so our DBA's can benefit from knowing which LUNs are for which application profile after they are presented to a host.