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That is possible but require a small trick.
First, you should add a "hint example" for each field;
Second, remove the field labels by injecting custom CSS codes to your form. This guide will help you: https://www.jotform.com/help/198-How-to-Remove-Field-Labels-in-a-Form
Note that adding Hint Example for Full Name and Phone Number field is not possible so I suggest you to use the "Text Box" field and label it accordingly, to have this method working to the whole form.
Awesome. Thank you.