JSON API call collapsing on dynamic children generation

Hi all,

I am struggling to find where the error are and have used so many API calls that I can't understand what is going on now.

I have an API call that is working correctly and bring this results. It works pretty well to integrate on charts, but when I add a Listview to list X values, it create an error.

This is the configuration to create children in the Listview, and I have tried all kind of value syntax

$, $.ForGraph, $[:] and S[:].ForGraph

All of them create a null value error. Se error screen below

Any recommendation on how to solve this issue?

appreciate.