Creating a Compare Chart with Pace

Dear All,
I would like to see how my pace in swimming and running developed over time. I saw that there is the option to select “Avg. Speed” for the Y-Axis of a custom compare chart which works but seems to give values in km/h.

Is there a way to format the axis to show these values in other pace formats such as “time/100m” or “time/1km”?

(or alternatively: Is there a chart that shows pace over time (ideally also with trendlines) for activities of a certain type? The Pace Curves only show best efforts per period and I would like to see rather the median or average pace curve.)

Thanks,
Christopher