I have created a Gantt chart and was able to customize it enough to my needs (hiding YAxis labels, custom ToolTips). However, I am struggling with adding custom "labels" at the bottom/X axis with the values respective to the sum of the (e.g.) percentage complete for all tasks for that given date.
If it does not make sense, here is an image representation of what I am trying to achieve.

Any help would be greatly appreciated!
Thanks,
Joe.