grouped horizonal bar chart

spec.json

{
  "$schema": "https://vega.github.io/schema/vega/v5.json",
  "description": "A basic grouped bar chart example.",
  "width": 300,
  "height": 240,
  "padding": 5,
  "data": [
    {
      "name": "table",
      "values": [
        {"category": "School/post-school", "year": 2011, "value": 28},
        {"category": "School/post-school", "year": 2016, "value": 27},
        {"category": "School/post-school", "year": 2021, "value": 25},
        {"category": "NEET", "year": 2011, "value": 38},
        {"category": "NEET", "year": 2016, "value": 40},
        {"category": "NEET", "year": 2021, "value": 41},
        {"category": "Employed", "year": 2011, "value": 33},
        {"category": "Employed", "year": 2016, "value": 32},
        {"category": "Employed", "year": 2021, "value": 33}
      ]
    }
  ],
  "scales": [
    {
      "name": "yscale",
      "type": "band",
      "domain": {"data": "table", "field": "category"},
      "range": "height",
      "padding": 0.2
    },
    {
      "name": "xscale",
      "type": "linear",
      "domain": {"data": "table", "field": "value"},
      "range": "width",
      "round": true,
      "zero": true,
      "nice": true
    },
    {
      "name": "color",
      "type": "ordinal",
      "domain": {"data": "table", "field": "year"},
      "range": {"scheme": "category20"}
    }
  ],
  "axes": [
    {
      "orient": "left",
      "scale": "yscale",
      "tickSize": 0,
      "labelPadding": 4,
      "zindex": 1
    },
    {"orient": "bottom", "scale": "xscale"}
  ],
  "marks": [
    {
      "type": "group",
      "from": {
        "facet": {"data": "table", "name": "facet", "groupby": "category"}
      },
      "encode": {"enter": {"y": {"scale": "yscale", "field": "category"}}},
      "signals": [{"name": "height", "update": "bandwidth('yscale')"}],
      "scales": [
        {
          "name": "pos",
          "type": "band",
          "range": "height",
          "domain": {"data": "facet", "field": "year"}
        }
      ],
      "marks": [
        {
          "name": "bars",
          "from": {"data": "facet"},
          "type": "rect",
          "encode": {
            "enter": {
              "y": {"scale": "pos", "field": "year"},
              "height": {"scale": "pos", "band": 1},
              "x": {"scale": "xscale", "field": "value"},
              "x2": {"scale": "xscale", "value": 0},
              "fill": {"scale": "color", "field": "year"}
            }
          }
        },
        {
          "type": "text",
          "from": {"data": "bars"},
          "encode": {
            "enter": {
              "x": {"field": "x2", "offset": -5},
              "y": {"field": "y", "offset": {"field": "height", "mult": 0.5}},
              "fill": [
                {
                  "test": "contrast('white', datum.fill) > contrast('black', datum.fill)",
                  "value": "white"
                },
                {"value": "black"}
              ],
              "align": {"value": "right"},
              "baseline": {"value": "middle"},
              "text": {"field": "datum.value"}
            }
          }
        }
      ]
    }
  ]
}