A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
You are correct that this is not uniquely an issue with Excel. This is an issue with Private Character Editor (or rather more likely an issue with my lack of understanding of Private Character Editor), however I did not see a better/more appropriate category to select.
Also, I wanted to provide a small background so as to not get comments to the effect of "why don't you just format a normal lower case 'p' as subscript".
Thank you for your feedback. Any additional comments or insight is appreciated.