{
  "$schema": "https://developer.microsoft.com/json-schemas/sp/column-formatting.schema.json",
  "elmType": "div",
  "attributes": {
    "class": {
      "operator": "?",
      "operands": [
        {
          "operator": "<=",
          "operands": [
            "@currentField",
            70
          ]
        },
        "sp-field-severity--warning",
        ""
      ]
    }
  },
  "children": [
    {
      "elmType": "span",
      "style": {
        "display": "inline-block",
        "padding": "0 4px"
      },
      "attributes": {
        "iconName": {
          "operator": "?",
          "operands": [
            {
              "operator": "<=",
              "operands": [
                "@currentField",
                70
              ]
            },
            "Error",
            ""
          ]
        }
      }
    },
    {
      "elmType": "span",
      "txtContent": "@currentField"
    }
  ]
}