Accessing Nested Values from JSON Objects

So I'm retrieving a JSON object with nested data via a GET call using the Smartsheets API. I'm able to retrieve the sheet's data, however I'm unable to find a way to access and parse through the data in IPAAS. For example, I can set a property equal to "GET rows", but from there I cannot access the cells within specific rows. The structure is as follows:

"rows": [
   "rowID":
   "cells": [
         "columnID":
          "value":
      ] ...

Optimally, I'd like to be able to access the variables nested inside "rows" and "cells" via a for each loop. If anyone has a solution, I'd greatly appreciate it! Thank you.