Oh-label-cell trendline time-period

Is there a way to change the default period on the oh-label-cell trendline from default to custom (say 24 or 4h). I looked at the documentation - there , also tried by adding period=xh to config, but that did not have any effect ?

At the moment there is not. The trend line makes a call to the persistence api with no start or end values so the api always returns the default 1 day period.