Vaadin 14, Charts 6 - styling Markers

I’m working on a scatterplot using Vaadin Charts, and would like to style the plot markers. I’m aware of the color index system, but it doesn’t quite suit my use case. Specifically I need to style the hover halo for each marker, and add different effects for markers on selection, which may not necessarily be in the same series.

However, it seems that I can’t apply CSS to individual Markers, and my options are limited to changing their shape and color index. Is there a solution to this?