conditional formatting of taskbar in Gantt chart

I am new to Smartsheet and not sure where to find the relevant info. I have figured out how to conditionally format in grid view (e.g. if item selected in dropdown menu of some column is x, then color the task name column green, etc) but I would also like to make the taskbar for that row in Gantt chart also green. And so on. In conditional formatting, I am able to select to apply some format to various columns of the sheet, but how do I apply the same to the Gantt chart (the taskbar color)? Thanks.

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