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

{
	"apiVersion": 2,
	"name": "core/code",
	"category": "text",
	"attributes": {
		"content": {
			"type": "string",
			"source": "html",
			"selector": "code"
		}
	},
	"supports": {
		"anchor": true,
		"fontSize": true
	},
	"style": "wp-block-code"
}