SL2 Slider Distinct Bands or Sections within the track fill

I read https://community.articulate.com/articles/fill-formatting-in-articulate-storyline-2 but I was wondering if there was a way either to add my own custom gradient presets or if there was an easy way of getting distinct bands of colour in the track fill of a slider?

Ideally I'd like the colours to be different shades of the same colour but its clear to the user where the stops are because its the border between 2 colour changes. 

I guess what I'm asking is there a way to control the amount of diffusion between the stops so I can have a crisper border between stops 

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