{
  "$schema": "https://developer.microsoft.com/json-schemas/sp/v2/column-formatting.schema.json",
  "elmType": "div",
  "children": [
    {
      "elmType": "span",
      "txtContent": "@currentField",
      "style": {
        "padding-left": "8px",
        "white-space": "nowrap"
      }
    }
  ],
  "attributes": {
    "class": "sp-field-dataBars"
  },
  "style": {
    "padding": "0",
    "width": "=if(@currentField >= 20, '100%', (@currentField * 5) + '%')",
    "box-sizing": "border-box"
  }
}