Global Styles: Should we Allow CSS properties that we don't manage at the moment?

[jorgefilipecosta]

In theme.json should we generate styles for properties we don't manage or provide an explicit UI control?
E.g. if a theme passes:

"core/paragraph": {
	"styles": {
		"textShadow": "2px 2px pink";
	}
}

Or

"core/paragraph": {
	"customStyles": {
		"textShadow": "2px 2px pink";
	}
}

Should we generate text-shadow styles for the paragraph or not?

[aristath]

YES!!!
If we do this then we're getting closer to a full JSON-based theme. Technically there's nothing stopping us from doing this... If we don't do it, then theme-authors will just add them to a stylesheet. which is fine, but not as good as having a single-source-of-truth in the JSON file ❤️

[pagelab]

If we do this then we're getting closer to a full JSON-based theme

It would be truly awesome to see that happen.

[carolinan]

This would be great or even necessary :)