How do I enter superscript text with Preview's PDF annotation feature?

Question

I can add text to existing PDF files with Preview. But how do I enter superscript text like 123m² ?

This normally works by selecting the appropriate menu entry

or shortcut, but I don't find such an entry with Preview and the shortcut does not work either.

Answer 1

I think you need to input Unicode superscripts via the Character Viewer or a text replacement shortcut. Superscript 2 is U+00B2 ²