REDCap does allow the use of some HTML and CSS in the Field Label and Field Notes.
Check out this example survey for formatting ideas: https://redcap.vanderbilt.edu/surveys/?s=JA3AXMHYC7
Styles of Fonts with HTML
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When you use the HTML code <font color="any color">Insert text here.</font>, you can get any color you want with the font. Here is a full list of named colors.
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