Chart symbol style expression

[#1]

Hi, i am using a Dispersion chart, and I would like to change the symbol style, it is dots/circle, and i would like to change for triangles. The thing is that on the expression this option is not available... So i was wondering if there is a expression for changing it, like for the lines in the charts.

Thank you all.

[Gysbert_Wassenaar]

The only thing you can change is the Look on the Style tab so that you get the same symbol shape for every data point (with different colors for different dimension values). There's no option to control which dimension value gets which symbol afaik.

[#3]

The thing is that for dispersion chart i can only use circles/dots, and I would like to change it for triangles, all of them, is this possible?