• metadata customTemplates

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    A way to add data to the custom templates placed in the /templates folder:

    {
    	"$schema": "https://schemas.wp.org/trunk/theme.json",
    	"version": 2,
    	"customTemplates": [
    		{
    			"name": filename",
    			"title": "Template Name",
    			"postTypes": [
    				"page"
    			]
    		}
    	],
    	"settings": ...
    }

    Source: https://developer.wordpress.org/block-editor/how-to-guides/themes/global-settings-and-styles/#customtemplates