in addition to my changes in telerik.chart.js - at addValue modify
var bar = new Bar({
color: myBarLabel,
and for the values add you color after the | ...
eg.
new SalesData
{
RepName = "Nancy Davolio",
DateString = "Aug 2010",
TotalSales = 10458,
RepSales = "2015|#83cc00"
},