How to make "progress" bar from chart in amcharts4?

Question

Canvas

I want to make a graph like in Ookla Speedtest, i.e. the graph is built from beginning to end. For the user to see the duration.
And in amcharts4, I always have it at full width, and when new data is added, all points simply shrink closer to each other. And how do you put them on top of each other?

Code:
https://codepen.io/fqyeh29/pen/zYvMZOm