Question on Webhook with complex JSON

[Anonymous]

We are working on Webhooks and mapping it to our Marketo fields. It seems though that if our service JSON is complex, we are not able to traverse through to the right field and map it over. Here is an example:
 

 
I am looking to map the Dictionary->Phone->Reputation->Spam Score to a field in Marketo, but not able to.
 
Is it possible to map such a nested JSON field?

[Anonymous]

Just need some clarification here on the flow of data:

1. You are describing the case of using a webhook in Marketo to call your server?
2. The JSON you are showing is the output of which system? 

[Anonymous]

Yes, that is correct. As part of Webhook, external remote service is our service.

And yes, the JSON is what the service will return as we plug in the url to our service.

[Anonymous]

Ping. Any guidance here will be much appreciated.

Thanks,
Kushal.