Change colors from Membership Names


A client wants to choose his own colors in the membership 2 plug-in. Is this possible?
At this moments, the plug-in chooses at random a color, but can't be modified.
They have a color for each group in their organization, and that's why they want to use the same colors in membership. It's OK if I can do this in code for example. It's not necessary the client can change this afterwards.

Thanks for the answer,