Add each issue to Google sheet as row

Create a new Action add a name to it and select application/json as template.
Select POST as method
Enter URL https://sheets.googleapis.com/v4/spreadsheets/<<YOUR_SPREADSHEET_ID>>/values/A1:append?valueInputOption=RAW
Select the Google authentication created before in https://rixter.atlassian.net/wiki/spaces/RIFJ/pages/1118306349 use the https://www.googleapis.com/auth/spreadsheets scope
In the body section add

{
  "values": [
    [
      "{{#issue.dueDate}}{{#format}} yyyy-MM-dd {{/format}}{{/issue.dueDate}}",
      "{{issue.customfield_122658}}",
      "{{issue.customfield_124659}}",
      "{{issue.customfield_124660}}",
      "{{issue.customfield_123438}}",
      "{{issue.customfield_145731}}"
    ]
  ]
}

Each element in the value array correspond to a column in the sheet.