Gap to "Favorite driver"

[sanpei3]

The current "Gap graph" is with the Leader.
I want to watch the Gap to "Favorite Driver" live.

For example, Gap to PER graph .
(Notice: In the above-linked graph, PER won that race. So after lap 19, we can watch with f1-live-data. I would like to watch this graph from lap 1(PER was in 3rd position).

I analyzed the dashboard.json file, but unfortunately, I couldn't find the solution.
If someone has a suggestion, please let me know.