Cool idea Mim! When you get it working make sure you participate to the WWC! Wappler Weekly Challenge #1 
As I see from the Tracking API - there all the data is a single object, so it has no repeating element, so you can use the data picker to just populate it straight on the page.
In expressions, something like {{ apiTrack.data.data.tracking_number }}
Just explore the data with the Data Binndings picker.