[Innovus] report the fanout of ICG

I am looking for one way to report the ICG fanout status, below pic is the example of the ICG connection

I could get the fanout count of ICG a :

> sizeof_collection [all_fanout -from a -endpoints_only] , then I will get 100+200+300+3(b,c,d)

Now, I want to get the regs count from a: 100; and b's fanout of regs: 200 and c's fanout of regs :300 respectively.

Any comments will be appreciated