Linechart Custom Tooltip

I am trying to create a custom tooltip for the line chart. I have the custom tooltip working except my dynamic data are returning as N/A in the tooltip. My datashape for the chart data are as follows:

xaxis: string

yaxis: number

lineLabel: string

My custom localization token value is as follows:

${label} #newline# ${Data:lineLabel}: ${value}

How do I get the lineLabel value to show here ${Data:lineLabel}? I am using the syntax provided by PTC docs link here...

https://support.ptc.com/help/thingworx/platform/r9.6/en/index.html#page/ThingWorx/Help/Mashup_Builder/Widgets/CreatingCustomChartTooltips.html