Checkout the fill of the bars that can indicate the progress of the tasks/subtasks that the bar represents.
Image 1: Bar fill indicates the progress in the xViz Gantt Chart
Steps to showcase Progress:
Simply add a column of Progress value (range 0 - 100) in the 'Progress' data field.
Image 2: Populate Progress field
Values like Progress for Parent bars are internally calculated in the visual using the information of the child bars. Refer the attached document link for understanding the calculations - Parent Level Calculation
