People have been complaining about this for years. I have to add 
and 
to strings of text in my artboards. The superscript version of the character must be the same size as the rest of the text string, or it will not be vertically aligned properly with the rest of the text.
The symbols are much too large, especially in headlines, but if you reduce the font size of that character, it drops down too low and is no longer in the superscript position.
In Sketch or any other proper app, you can adjust the baseline of the specific character (baseline shift) so that you can re-align it properly.
You can EASILY accomplish this in CSS and create specific styling for the “sup” tag which handles this in code.
Why is it nearly impossible to replicate what is easy in any other app in Figma? I’ve seen people complaining about this since 2018, so I take that as an assumption that Figma will never fix this issue?
The only way to get a properly aligned and sized or in a line of text is to create a separate text block and align it manually. And across an entire prototype that is a ridiculous solution.