Color setting of legend in report

Hello,

if I have a report using Stacked Vertical bar. The calculation was ok, but I find no way to configure the color for legend. E.g. on one vertical bar I have 3 different values: sla breached, sla running, sla achieved. Is it possible to set red to sla breached, blu to sla running and green to sla achieved? I have SM 9.41 P4HF6.

Thanks,

Tianying