Using highcharts to add label the name of the series

[benatdaasity]

I'm trying to use the advanced config editor to add series labels to the chart. I have a pivoted dimension and want each line to have a label that is the value of the pivoted dimension. I found this example from the highcharts forum that shows basically exactly what I want to do ... https://jsfiddle.net/BlackLabel/hmtdczok/ ... but it doesn't work when I try to run in Looker. 

Does Looker not allow to use functions within Highcharts? What can and can't we do with highcharts? There's not really good documentation on this.