WordPress/wp-includes/blocks/more/block.json

{
	"name": "core/more",
	"category": "design",
	"attributes": {
		"customText": {
			"type": "string"
		},
		"noTeaser": {
			"type": "boolean",
			"default": false
		}
	},
	"supports": {
		"customClassName": false,
		"className": false,
		"html": false,
		"multiple": false
	}
}