Waterfall Chart to show values on top of each bar

Hey,

I have converted Column chart into Waterfall chart using the script provided in Sisense Community. Now my concern is the values are not showing in an appropriate manner, I need the value to be displayed on top of the each bar, and negative values displayed on the bottom of the bar, in a manner. Can anyone help me in editing the script please. 

CODE:

Image: (In my case positive values are red and negative values are green)

Appreciate your help and support.

Thanks