When you have set up scenario automation to Send Email to Requester, an email notification will be sent to the requester. However, these email notifications will not be included as a part of the ticket thread.
If you are looking for the emails sent to the requester to be included as a part of the ticket thread, you can make use of the 'Reply' option instead of the scenario automation. You can make use of the "Bulk Update" option and send a reply to all the selected tickets. This will allow you to send out bulk replies to 30 tickets at a given time.