Allow conditional formatting in KPI cards

The current KPI card doesn't allow for a middle orange value. It's either green if the value is above target and red if it's below target. There doesn't appear to be the option to have a middle ground whereby, if the value is between the highest and lowest target then it can be orange - or some other colour. 

This seems very binary and doesn't reflect how our business compares a value against benchmarks where we use RAG indicators a lot.