Yes, only copy-paste is the way to add emoji in your title. This forum only provided few standard emoji, as you can see when you want to create post/thread.

You can choose emoji what you want to use here https://emojipedia.org/

Keep in mind not all emoji can be used in this forum and most outside emoji doesn't work on windows.

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Personally I don't like using emoji on topic title since its make forum mess and hurt my eyes.