[xmonad] make DynamicLog prefix workspace names with number

Hi, Is there any easy way to get DynamicLog to prefix the names of workspaces with numbers? For instance, I have workspaces named "web", "mail" and "local"; I want these to show up in my xmobar as "1:web", "2:mail", and "3:remote". Of course I would just name the workspaces that way, but I also use DynamicWorkspaces, which would make that tricky. Thanks! --Omari