I figured out how to use custom properties in shaders and the compositor (Shader AOV). Here's a quick cheat-sheet to get you started. : r/blenderTutorials
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Right-Click Select — Blender Community
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Creating Custom Properties in color, degree, float, and Booleans Value | blender 2.9 - YouTube
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Export Custom Properties? · Issue #23 · xavier150/Blender-For-UnrealEngine-Addons · GitHub
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Mesh Custom Properties editing through the Blender API
Allow Custom Properties as Inputs for Material Nodes — Right-Click Select
Custom Properties — Blender Manual
Custom properties and drivers in blender made easy - YouTube
Custom Properties - Blender Exporter
add on - Blender Dev: Hide Custom Properties? - Blender Stack Exchange
python - Adding Other types of Custom Properties - Blender Stack Exchange
python - How to show custom property as enum? - Blender Stack Exchange
materials - Use custom properties (variable values) in the node editor - Blender Stack Exchange
Add extra data types to custom properties — Right-Click Select
Custom Properties — Blender Manual
Adding custom properties to Collections - Blender Development - Developer Forum
Darkfall : Blender Python Tutorial: How to add an Enumerator to a Panel & Create a Property Group
