Can you change the colour of tick mark values and add a coloured line fill?

[JamesJohnson]

I’ve built a line graph with a secondary y axis, and noticed that Looker creates a (visual) link between each line and the associated y axis, through aligning the line’s colour with the colour of the associated y axis label.

Visually, I don’t think this link is very clear and it’d be great if I could introduce more colour elements to each y axis (namely the tick marks, tick values and the ability to add a coloured axis line).  I’m unaware of how to do this within Looker (and have tried to search for an answer without success).

Is anyone aware of how to do this?  If this isn’t possible, is there somewhere I can create a feature request for this use case?