Is there a possibility to extend the number of different color to use in a scatter chart ? It seems to be only 18 colors. For more dimension, there's a loop.
It appears that you can add a color expression for the background color of the X axis, and it will color the data points. You'll have to calculate the color values yourself, but you can have any number of them. For instance, if I have a numeric ID for each data point I'm plotting, I could do this for 256 shades of gray:
