This manual refers to Conditional Formatting in Power BI tool, which works similarly to Conditional Formatting in Excel. 

How to do it?

Use some of the table (not chart) visuals in Power BI Desktop.

Then click on some item placed in Values (like if you need to switch between sums, averages…). Click on Conditional Formatting.

Set the color scale. Honestly, it is very simple so far – compared to Excel.