Training load form chart

Hi guys not sure if it is possible but i was trying to edit the standard training load form chart which is exxellent but instead of absolute or percentage for the form calculation i wanted to used a specified # of standard deviations any ideas?

I am not quite sure if this what you are after but you can plot a moving average of form and then click the dot dot dot menu and fill in the “band” parameter to show standard deviations from the average (0.5 in this example):