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I see the bookmarks in pdf files are always plain text. Is there a way to make them shown as themselves in the contents? For example:
You can use Unicode characters, but not something like emojis.
For example, superscript 2 can be used with this: ²
See here for more details: https://unicode-table.com/en/00B2/
Lower-case-delta Superscript-2 Capital-Latin-H is something I'd consider to be "plain text" in the Unicode world. You can copy and might be able to paste this:
It may be a lot of study and work if your document doesn't use Unicode.