[ndnSIM] How to get the number of hops passed by Data packet from route node to consumer

[L]

Hello, everyone
   I know that hopCount can be used to calculate the number of hops passed by the Data packet from the producer to the consumer, but when the Interest packet is satisfied in the route node, that is to say, the route node caches the corresponding Data packet. How should I get the number of hops that the packet has reached the consumer?
Best wishes,
Zhen
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