Based on one of your previous advises, I tried:
(push '("\\\\textsuperscript\\>" . "⁺") ml/symbols)
It works great. However, now I need to treat the whole \textsuperscript{ANY THING} as
the mathematical superscript and raise it up. I looked at the
superscript function of your code but my little knowledge of elisp was a
challenge. Any help?