Straight to the questions
- ...I only want to display the series label on top of the bar for the second series, which is always "current billing cycle"....
For this requirement you should set labels.visible true
only to the second series:
"previous billing cycle"
"current billing cycle"
- I want the series label to be a percent change between the first series and the second series. Should I do this calculation in the parse function?
Yes, in order to achieve this you should manually calculate the percent change. A similar basic example is available here
- Is there a way to create a template to look at the data item and see what the series name is (which I will know) and only output the value for that series name?
The fields which can be used in the series.labels.template for column chart are:
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