@Niku you use SPIN JSON:
https://docs.camunda.org/manual/7.8/reference/spin/json/01-reading-json/
In a script output parameter, you can so something like S(response)
That will convert your json into a SPIN json.
Then in expressions when you want to access the json you can do something like
${myJson.prop('status').value()} which would return "Review" based on your example.
See the link above for more details.