Suggestion on mapping Integration response

I am getting the below response from Integration which is of type HttpResponse

[statusLine=HTTP/1.1 200 OK, statusCode=200, headers=[object Object], contentType=application/json; charset=utf-8, body={"jobId":"01091664F27E4771A9B92AEA0CC577ED"}].

I need to get the JobId value from the above and i ll have to map it to a process variable. To achieve this, i used an expression rule and used the below code:

if(
a!isNotNullOrEmpty(ri!integrationResponse),
a!fromJson(
index(ri!integrationResponse, "body", null)
),
{}
)

It resulted in "[jobId:01091664F27E4771A9B92AEA0CC577ED]" but i only need the JobId value from it. I tried various functions but nothing seems to be working. 

Can someone please suggest on how to proceed with this?

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