Bar chart in Looker

I have plotted a bar chart between profit and date ( date is in strings format) and I basically want this bar chart to show me %change over each bar to the previous bar (month to month %change) and I can't find a way to do this.
I need to know how to add this field and how to add that label once the field is added.  
The alternate option (it will be a long process) is to open the Excel sheet and create a new field called %change but still, if I plot the profit and date bar chart, I can't add the "%change" label in that bar chart.
Someone, please help me on these both cases

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