wordpress-develop/src/wp-includes/theme-i18n.json

{
	"settings": {
		"typography": {
				"fontSizes": [
					{
						"name": "Font size name"
					}
				],
				"fontFamilies": [
					{
						"name": "Font family name"
					}
				]
		},
		"color": {
				"palette": [
					{
						"name": "Color name"
					}
				],
				"gradients": [
					{
						"name": "Gradient name"
					}
				],
				"duotone": [
					{
						"name": "Duotone name"
					}
				]
		},
		"blocks": {
			"*": {
				"typography": {
					"fontSizes": [
						{
							"name": "Font size name"
						}
					],
					"fontFamilies": [
						{
							"name": "Font family name"
						}
					]
				},
				"color": {
					"palette": [
						{
							"name": "Color name"
						}
					],
					"gradients": [
						{
							"name": "Gradient name"
						}
					]
				}
			}
		}
	},
	"customTemplates": [
		{
			"title": "Custom template name"
		}
	],
	"templateParts": [
		{
			"title": "Template part name"
		}
	]
}