Custom function (total acceleration) and where can I get reference laps?

I do motorcycle track days and would like to get the total acceleration (lat + long via Pythagorean formula) in the chart plot. How do I add that? I see it's available as a circle plot in the video overlay but I want the chart as well.

Also where can I get reference laps? On my Chromebook RaceChrono says something about not being connected to the internet.
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