Qualtrics JavaScript Add Checkbox to Flag Questions

I am creating a pilot survey in Qualtrics to make sure all my questions are clear and easy to understand. For each question, I want to add a checkbox or some other feature so respondents can flag the question as badly-worded or difficult to understand. The checkbox would appear below the answer choices or text boxes. Is there a way to do this via the JavaScript editor in Qualtrics?

I don't want to ask a separate question after each question to ask if the previous question was unclear. It would take up too much space and annoy respondents.