CartesianChart manually adding LineSeries leads to random colors

[JaggerJo]

I have a CartesianChart that gets new line series assigned based on what a user configures. This works great, the only problem I'm facing is that the series gets new colors on every change.

This is to be expected because I never explicitly set the stroke/point color.

Optimally I'd like to keep it that way and not specify the colors myself.
Instead want to infer the color from the series index / provide a seed if there's some randomness involved:

1st series -> first color
2nd series -> 2nd color
...

Is there a recommended way of solving this?