Hi.
I have not read you post completely.
Based on the title, it seems you need some way to convert the API response data in a format that your Chart can understand as input.
We are doing this extensively using the cool RunJS module here 🚀 RunJS 1.3.1.
We don’t have a chart step like you do, be we are manupulating JSON data to be output-ed in a sepcific format on client side using this module.