Conditional Formatting for Report Groupings

Being able to use conditional formatting, specifically background/row colors, is very useful in reports. I want to be able to use this for GROUPINGS in a report so I can visually separate the groupings in reports where we have repeated groupings (like different groupings for different teams that may have more than 1 grouping). I don't want the rows within the grouping all a color because that can get busy, but really wish I can add background color to the grouping rows themselves.