{
  "$schema": "https://vega.github.io/schema/vega-lite/v5.json",
  "description": "A vertically oriented funnel chart with centered bars and labels",
  "data": {
    "values": [
      {"stage": "Stage 1", "value": 1000},
      {"stage": "Stage 2", "value": 750},
      {"stage": "Stage 3", "value": 500},
      {"stage": "Stage 4", "value": 800},
      {"stage": "Stage 5", "value": 100}
    ]
  },
  "transform": [
    {
      "window": [{"op": "max", "field": "value", "as": "max_value"}]
    },
    {
      "calculate": "(datum.max_value - datum.value) / 2",
      "as": "start"
    },
    {
      "calculate": "datum.start + datum.value",
      "as": "end"
    }
  ],
  "layer": [
    {
      "mark": "bar",
      "encoding": {
        "y": {
          "field": "start",
          "type": "quantitative",
          "axis": null
        },
        "y2": {
          "field": "end",
          "type": "quantitative"
        },
        "x": {
          "field": "stage",
          "type": "ordinal",
          "sort": {"field": "value", "order": "descending"},
          "axis": null
        },
        "color": {
          "field": "stage",
          "type": "nominal",
          "legend": {"title": "Stages"}
        }
      }
    },
    {
      "mark": {
        "type": "text",
        "align": "center",
        "baseline": "middle",
        "dx": 0
      },
      "encoding": {
        "y": {
          "calculate": "(datum.start + datum.end) / 2",
          "type": "quantitative"
        },
        "x": {
          "field": "stage",
          "type": "ordinal"
        },
        "text": {
          "field": "value",
          "type": "quantitative"
        }
      }
    }
  ]
}