Citect 2018 Evaluation-Trend in SA-Project -Zero/Full range set by Variable Tag

Hi,

I'm testing the trend functionality, we are reading low and high range for an analog signal dynamically from the controller. I.e we define both low and high range with their own variable tag.

The Zero Scale/ Full Scale Fields in Trends setup seems to not take a variable tag

Is there a way to set Zero/Full range values from a variable tag? 

Thanks for any input,

Regards

Rune