UCLA Waitlisted - Are you writing an essay in your Opt-in response?

When opt-in to be on Wait list UCLA asks about: your Fall semester grades, Spring semester classes and Additional Information.
What do you guys put under additional info? Should I plan to write an essay?

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wait same I read somewhere that if it’s our top choice we should make sure to show them how dedicated we are to the school and how good we’ll be academically…