googlechromelabs.github.io

{
  "type": "object",
  "properties": {
    "column": {
      "type": "string",
      "description": "Column letter the new columns go left of, like C. One past the last column adds them at the end."
    },
    "count": {
      "type": "integer",
      "description": "How many columns to insert.",
      "default": 1,
      "minimum": 1,
      "maximum": 52
    },
    "sheet": {
      "type": "string",
      "description": "Sheet name. Leave out to use the sheet on screen."
    }
  },
  "required": [
    "column"
  ]
}