Layout | article description downwards and increase width

Our article description is often very long.

Therefore I would like to move the text downwards. I also want to increase the width.

At http://pdfmake.org/playground.html I was not successful.

Screenshot => https://yadi.sk/i/1SbsWpgVD0cpAQ

[
  {
    "columns": [
      {
        "stack": "$accountDetails"
      },
      {
        "stack": "$accountAddress"
      },
      [
        {
          "image": "$accountLogo",
          "fit": [
            120,
            80
          ]
        }
      ]
    ]
  },
  {
    "columns": [
      {
        "width": 340,
        "stack": "$clientDetails",
        "margin": [
          0,
          40,
          0,
          0
        ]
      },
      {
        "width": 200,
        "table": {
          "body": "$invoiceDetails"
        },
        "layout": {
          "hLineWidth": "$none",
          "vLineWidth": "$none",
          "hLineColor": "#E6E6E6",
          "paddingLeft": "$amount:10",
          "paddingRight": "$amount:10"
        }
      }
    ]
  },
  {
    "canvas": [
      {
        "type": "rect",
        "x": 0,
        "y": 0,
        "w": 515,
        "h": 25,
        "r": 0,
        "lineWidth": 1,
        "color": "#e6e6e6"
      }
    ],
    "width": 10,
    "margin": [
      0,
      30,
      0,
      -43
    ]
  },
  {
    "style": "invoiceLineItemsTable",
    "table": {
      "headerRows": 1,
      "widths": "$invoiceLineItemColumns",
      "body": "$invoiceLineItems"
    },
    "layout": {
      "hLineWidth": "$notFirst:1",
      "vLineWidth": "$none",
      "hLineColor": "#e6e6e6",
      "paddingLeft": "$amount:8",
      "paddingRight": "$amount:8",
      "paddingTop": "$amount:8",
      "paddingBottom": "$amount:8"
    }
  },
  {
    "columns": [
      "$notesAndTerms",
      {
        "width": 160,
        "style": "subtotals",
        "table": {
          "widths": [
            70,
            60
          ],
          "body": "$subtotals"
        },
        "layout": {
          "hLineWidth": "$none",
          "vLineWidth": "$none",
          "paddingLeft": "$amount:10",
          "paddingRight": "$amount:10",
          "paddingTop": "$amount:4",
          "paddingBottom": "$amount:4"
        }
      }
    ]
  },
  "$signature",
  {
    "stack": [
      "$invoiceDocuments"
    ],
    "style": "invoiceDocuments"
  }
]

One option may be to remove the product key from the invoice (on Settings > Invoice Design > Product Fields) and add the text to the start of the description.

This video covers adjusting the widths: https://www.youtube.com/watch?v=pXQ6jgiHodc