Setting series colours dynamically in a formula

Hello,

I am trying to find a method to colour a series based on a dynamic criteria from a formula. The formula below is used in a scatter plot. It either identifies a facility or make a ID:1234 generic key.

if {Code} = 'ABCDE' then

  {Facility}

else

  'ID:'+ToText(Key},0,'')

In this formula, if the Code matches then I went to identify the Facility and have the series in colour defaulted by CR. If it is an ID:1234 series, then i want it to be grey.

Is there a way to set this property dynamically. I don't want to have to grey out each series in a top 50.

Thank you