Netflow Ingress Only

Hello,

im currently using Cisco NCS 5500 and this only supports Netflow Ingress, in the past with ASR9000 i would enabled netflow on a interface and be able to see inbound and outbound traffic.

But with NCS 5500 being capped to ingress only how im stuck with only inbound traffic, how can i check my outbound traffic flow ?

Im currently generating flow from my NCS 5500 o my internet facing interface. Should i generate flow also on my core facing interface to be able to see the outbound traffic ?