Need help in Calculation Groups

Hello Team,

      I am having Actuals and Targets like below
Actual=(num1, dem1)

Target=(num2,den2) and these Actual , Target added to Gauage chart.

Problem:-

  I have almost 15 metrics which calculating Actuals and Targets. so we have decided to go with Calculation group like single group

that takes inputs from chart. But problem is how can we pass num1,num2 as numerator and den1,den2 as denomenetor to calculation groups.