Conditional formatting Totals with Gradient

Hi, 

I am trying to add conditional formatting to a Matrix visual, I want to format the background as Gradient, going from Lowest value (red) to Highest value (green). Please see below the settings that I would like to use:

My issue is that I need this formatting to work on Totals as well, however when I change that the settings are to be applied to Totals, PowerBI wants me to input a customer number, it no longer has the option for Lowest/Highest value. Is there a workaround for this? 

Thanks!