Page Setup & Headers/Footers

{
  "worksheets": [
    {
      "name": "Landscape",
      "rows": [
        { "cells": [{ "value": "Product" }, { "value": "Q1" }, { "value": "Q2" }] },
        { "cells": [{ "value": "Widget A" }, { "value": 100 }, { "value": 200 }] }
      ],
      "pageSetup": {
        "orientation": "landscape",
        "paperSize": 1,
        "fitToWidth": 1,
        "fitToHeight": 0
      }
    }
  ]
}

{
  name: "Landscape",
  rows: [
    { cells: [{ value: "Product" }, { value: "Q1" }, { value: "Q2" }] },
    { cells: [{ value: "Widget A" }, { value: 100 }, { value: 200 }] },
  ],
  pageSetup: {
    orientation: "landscape",
    paperSize: 1,
    fitToWidth: 1,
    fitToHeight: 0,
  },
}

{
  "worksheets": [
    {
      "name": "Report",
      "rows": [{ "cells": [{ "value": "Data" }] }],
      "headerFooter": {
        "oddHeader": "Sales Report - &P",
        "oddFooter": "Confidential"
      }
    }
  ]
}

{
  name: "Report",
  rows: [{ cells: [{ value: "Data" }] }],
  headerFooter: {
    oddHeader: "Sales Report - &P",
    oddFooter: "Confidential",
  },
}

{
  "worksheets": [
    {
      "name": "Blue Tab",
      "tabColor": { "rgb": "FF4472C4" },
      "rows": [{ "cells": [{ "value": "Blue" }] }]
    },
    {
      "name": "Theme Tab",
      "tabColor": { "theme": 3, "tint": 0.3 },
      "rows": [{ "cells": [{ "value": "Theme color" }] }]
    }
  ]
}

{
  name: "Blue Tab",
  tabColor: { rgb: "FF4472C4" },
  rows: [{ cells: [{ value: "Blue" }] }],
}