Shape Random Color change

With Shape Layers and its Repeater Operator, you'll have to Unbake the repeater so that each dot appears on its own layer. THere's a free script to do this - https://github.com/ae-scripting/shapeRepeaterBaker?tab=License-1-ov-file#readme

But a Text Layer might be a better option and can be very quick to set.

I've also got a set of add-ons/scripts that can do this sort of thing a lots more and with lots of control over keyframe timing without touching a single keyframe - even while setting up the animation for hundreds of layers. 


HTH