Create Email template with Survey link in C4C

I am trying to create SAP C4C Ticket process in which when the ticket is completed successfully an E-mail has to be sent to the end customer with a survey link using a workflows.

As per SAP standard document "SAP Cloud for Customer Administrator Guide" we can add the survey in the document bases E-mail template using the place holder #SURVEY#.

But if I add this place holder in the HTML file and then upload it while creating the workflow. I cannot find any corresponding field for Survey.

So how can we add a survey link to an email?