Hi Gary,
First, thank you for the reply!
Next, what exactly do you mean by a "note field"? The only options to add to a survey are listed under "common questions" and include single line text, multiline text, etc. I see no option to add a "note field" from the available gadgets.
Lastly, some people have responded with using HTML in accordance to the directions here Style your survey—Survey123 for ArcGIS | ArcGIS However, the HTML is only for survey title and/or description, not for any mid-form sections that contain text that isn't part of a question, see image below. You can see I was indeed able to format the form's title and description. However, trying to format a gadget (i.e. single line text, multiline text, etc.) does not produce the same results.

I must be missing something.
Thank you!