gantt chart with ability to add milestones

You need the ability to have milestone (0 duration) items appear as diamonds or triangles on the Gantt chart bars. so the bars show the task or project duration via start date and end date. You then can add to those bars milestone dates that show up as diamonds or triangles, the way it is shown in MS Project.

Please see the community post here for a better description and visual:

https://community.powerbi.com/t5/Custom-Visuals-Ideas/Gantt-Chart-Collapsed-with-Milestones/idi-p/342907