There is an ulgly but workable method to get even sub-minute data from the Power Meter.
Without going too crazy, you can get around 2s resolution from a 1hr screen grab using WebPlotDigitizer.
It looks like the dev on WPD for R is on hold for last few years but the current web version is functional.
Here’s a DATA (= red, shifted 20px in Y-axis for clarity) vs SCREEN GRAB (gray) 1hr plot of 2670 datapoints of what would ideally be 3600. My screengrab dimension was 2456 x 1090. Not trying too hard. You could of course display a smaller time chunk and get higher resolution. Keying in the timescale in the web UI helps keep things mapable.
There are a couple of anomalies I didn’t bother fixing in the .csv export.
