Setup theme.json with custom colors for WordPress 5.8

This post is more of a “research” note I had while looking into the theme.json file for themes on WordPress 5.8. You can read the introduction post here: Introducing theme.json in WordPress 5.8 – Make WordPress Core or the documentation here: Global Settings & Styles (theme.json) | Block Editor Handbook | WordPress Developer Resources.

What is the theme.json? You can think of it as the style guideline a developer can set for a theme. This file will define what colors the editors will have access to, what font sizes, what type of values can be written and what options different build-in blocks will support.

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