Inability to apply random step ATR Based Stop and Trailing Stop configurations into 'Then Action(s)'

I have successfully applied random step configurations into long and short entry signals. Refer (Capture 1) below.

However when I attempt to apply random step configurations into the Stop Loss or Trailing Stop Loss in the 'Then Action' by selecting for example the ATR multiplier variable (Refer Capture 2).... to select a range of 1:5:1 (1 start, 5 finish and 1 step)

My options then reduce to the ability to only apply a single string for a single variable. I now no longer can set the randomiser for the ATR period for example. (refer Capture 3).

I want to be able to randomise both the multiplier and the ATR period in a stop or trail.

Please advise if this is a bug or if there is a workaround?

Thanks

Rich