One of the units that my 4th grade students learned was all about how to make a literary essay. As a group we read the story How to Steal a Dog by Barbara O'Connor. The presentation is connected with that book. However, I wouldn't say that you would necessarily need to have read the book to use it as an example that will be helpful to your students.
After we completed reading the book as a group read aloud, the students read the book Sadako and the Thousand Paper Cranes by Elanor Coerr. Students read the book and created their own essays from it.
Along with the presentation, I have uploaded some free student examples to my account for How to Steal a Dog and for Sadako and the Thousand Paper Cranes. You're welcome to use these resources as examples that the students can give grades to when analyzing what makes a strong literary essay. All of my students are English Language Learners so be kind to their vocabulary choices and structure of their essays!
I hope that you and your class find the resources helpful in teaching literary essay.