I found a way to do this now.
args.e.areas = [
{ height: 40px, cssClass: "semi-transparent", left: 4, bottom: 1, right: 1, backColor: "#bfbfbf", html: "<div style='height: 40px'></div>" + umlagerungszeit + "min Umlagerungszeit", style: "font-size: 10px; padding: 0px 0px 0px 2px; color: #1a1a1a"},
];