{ "$schema": "https://vega.github.io/schema/vega-lite/v4.json", "data": { "values": [ {"country": "USA", "gold": 10, "silver": 20}, {"country": "Canada", "gold": 7, "silver": 26} ] }, "transform": [{"fold": ["gold", "silver"]}], "mark": "bar", "encoding": { "column": {"field": "key", "type": "nominal"}, "x": {"field": "country", "type": "nominal"}, "y": {"field": "value", "type": "quantitative"}, "color": {"field": "country", "type": "nominal"} }}