You can not.
What would be its usefulness?
In other words, what is your intention/purpose ?
Thanks - I appreciate knowing it is not possible.
The usefulness would be in scientific applications. For example, subscripts in chemical formulae, and superscripts in genotypes.
A far as my purpose - I work in an academic lab, and am consolidating 20+ years of bacterial strain collection inventories stored as individual fp7 and Excel files into one fp12. In some of the files the researcher has used superscripts in the genotype descriptions. I am trying to avoid editing the files as much as possible but in this case it will be necessary.
" I am trying to avoid editing the files "
How do you want to edit them ? Maybe we can find an automated way.