legend-doughnut-top-center-single.json

{
    "config": {
        "type": "doughnut",
        "data": {
            "labels": ["0"],
            "datasets": [{
                "data": [10]
            }]
        },
        "options": {
            "responsive": false,
			"legend": {
				"position": "top",
				"align": "center"
			}
        }
    },
    "options": {
        "canvas": {
            "height": 256,
            "width": 512
        }
    }
}