Unique field formatting for headers/values/subtotals/totals

The ability to set alignment, background and foreground colour for each of my values in Field formatting is great, however it doesn't quite go far enough for full flexibility.

At the moment you can only customise a field once and choose what that applies to. If I want to have a different fill for a field I can only choose one fill colour and choose what to apply it to.

This means I can't do things like have a darker colour for the header and a lighter version of the same colour against the values. At the moment all I can do is set the darker colour for the header and leave all the other formatting unchanged.

This isn't ideal for full flexibility of formatting at we would be used to when making an Excel report.