Aescripts Label Maker 1.2 for After Effects

Label Maker analyses your selected layers pixels and automatically sets the label colour to match.

Compatible with AE CC2015 and up on Windows and Mac.
Installation directories:

Windows:
Program Files\Adobe\Adobe After Effects [version]\Support Files\Plug-ins

Mac:
Applications/Adobe After Effects [version]/Plug-ins

https://aescripts.com/label-maker/