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

{
	"name": "core/column",
	"category": "text",
	"parent": [
		"core/columns"
	],
	"attributes": {
		"verticalAlignment": {
			"type": "string"
		},
		"width": {
			"type": "number",
			"min": 0,
			"max": 100
		}
	},
	"supports": {
		"reusable": false,
		"html": false,
		"lightBlockWrapper": true
	}
}