Gantt Chart - Markers

[Honeyeater]

Hi everyone. I've made a Gantt chart that requires markers on each bar for a mean. I have manually placed markers there, but does anyone know if there is a way to include a marker in the data itself? Every time I update the data, the chart changes and the markers don't as they are just pictures. I have tried everything I can think of but cannot get it to work. The closest I could get was to have the mean numbers on a secondary Y axis, but this did not work either as the values are in the x axis. This is probably not the correct use of a Gantt chart, but it represents the data better than any other type of chart. Any advice would be greatly appreciated.

 

[Honeyeater]

Actually, I have worked it out using this Bar Chart Target Markers - Excel University in conjunction with the Gantt chart instructions. I realised as well that the numbers for the markers would only show correctly if I manually reversed the order.