Not. On a general basis, we can be sure that if such a symbol existed, it would be in the block superscripts and subscripts (not all superscripts, but the likelihood that if any superscripts are added, they will be placed there).
So, you need some kind of higher-level protocol, as you usually do when you need superscripts with a fairly limited repertoire. Unicode refers to character encoding, not layout and mathematical expressions.
Jukka K. Korpela
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