A Gantt chart is a running list of activities with the duration for each displayed as a horizontal bar depicting the beginning and ending day along a horizontal scale. The challenge is that this is not a standard chart type in either Power BI or SSRS/Paginated Reports. Furthermore, project planners may prefer to see activities as rows in the format of a printed page, as you can see in this example:
I like Gantt charts more than is probably healthy. Paul shows a method which isn’t exactly easy but it does the trick.