Recommendation letter question

When I am filling out the "form" for the recommendation letters to be emailed to teachers, there is a text box that allows you to tie a personal note to the email that is sent. My question;
Will anyone from CGA read what I type in this? Could I put suggestions for the teacher to write in the essay or will admissions see this?

Thanks for your time. Hopefully someone that has direct experience or knowledge about this can chime in.