Google Charts formatting features#172

Features request for wpDataCharts Google Charts engine to more closely match some of the features in the HighCharts engine and/or some of the formatting features in native Google Data Studio charts as follows:

• Value prefix for Tooltips like HighCharts and Google Data Studio
• Option for compact numbers like HighCharts and Google Data Studio
• Ability to add a date field like HighCharts and Google Data Studio
• Data Labels like Google Data Studio (see attached bar chart example screen shot)

Google charts data label documentation https://developers.google.com/chart/interactive/docs/gallery/barchart#labeling-bars

I also need the data labels so that mobile users can see the data value.

After further research I do see that it is possible to add the labels using wpDataCharts callbacks but it requires some knowledge of JavaScript. The addition of data labels native in wpDataCharts for at least one of the render engines eg. HighCharts would be awesome.