New Update : 01-10-2019
Few weeks ago i have this extension, Anon-visible component that provides access to the Google Spreadsheet. You can use this extension to Upload, Update, Delete & Read data from the Spreadsheet. This extension needs API key to read/write data on spreadsheet. Please refer to the Cloud Sheets for more information.
NOTE : You can download the extension from Cloudsheets website.
If you have any query or suggestion then let me know in the comments or you can send email at [email protected]
A big thanks to @Domhnall