Prepend Data to a Graph

I have a large dataset that I am partially visualizing with a line chart. I would like to load into the data at a specific point, lets say x=[50;70]and when I pan the chart to the right I would like to load and prepend x=[30;50], so that I can view x=[30;70].

I know that extendData exists for dcc.Graph but when using it, it will connect x=70 to x=30 with a line which is not what I want.

Is there anything available to do that or could anyone point me into the right direction so that I can implement it myself?

Thanks again for the great library!