How do I send emails using Smart Assistant with the subject and email body?

How do I send emails using Smart Assistant with the subject and email body?

1. @mention a user by typing "@" and the user's name.
2. Type ":" and select the Subject from the drop-down menu.
3. Write the subject and hit Enter.
4. Any content typed after hitting enter will appear in the email body.
5. Fill in the email content and select Send Email from the drop-down menu.