iTest: how to process IxNetwork 'show stats' in order to evaluate a group of streams

Hi, I have a doubt about how to proccess a response from the IxNetwork command: show stats "Flow Statistics". I have lots of traffic streams in the response and I would like to check that some of them are UP. I use the same stats in different points of iTest programming and in the different points I check a different group of streams. I would like to evaluate a group of streams each time (for example streams from 3 to 17 or the first 12 streams).

I would like to do something like that:

query RxRateMbps("Lado WAN Lado LAN VLAN3001 239.0.101.$i_stats") inside a for loop, but I understand that it is not allow in itest.., so I can't do it..

I leave here the response maps with the output of the ixnetwork command,

show-stats-flow-statistics.ffrm

maybe someone of you could help me with this question.. Thank you!

pat