Couldn't fetch a checkbox (comma separated) questions by script

I have connected entries by a Google sheet script for non checkbox questions successfully. However checkbox questions couldn’t be fetched by the script. I need a response from any humble person or Epicollect5 community. Please don’t forward my questions to survey toolkit community. Pardon me Because they are not responsive for your fast response.

Thanks for reaching out with your query regarding Google Sheets support.
We understand your need for assistance; however, please note that our community primarily focuses on discussions related to Epicollect5.

While we strive to provide helpful guidance whenever possible, support for Google Sheets-related inquiries may be more appropriate on platforms or forums specifically dedicated to Google Workspace or spreadsheet-related topics.

For example, to get help aboout Google Apps Script, there is a dedicated community at →