If just done a quick check using our own Paper docs. Currently we don't have this option in Dropbox Paper, but I'll forward your comments to our development team to see if they could implement this.
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On my Mac, using Firefox, I found if I copy text from an HTML view that contains a superscript, Dropbox Paper will retain the superscript pasting that content into a document (as long as the content isn't only a superscript, but contains both regular text and superscript).