BTW, you may use emoji from Emojipedia.
Select an emoji an then press a “copy” button:
then paste it into a code.
Works with a HA Editor, Visual Studio Code, even Windows Notepad.
Specifying an emoji by a code like “\u123456” does not work.
But if you know a code - you may find a picture by this code on that Emojipedia site.
Input a code into a “search” field:
I kept creating bug reports and error reports and never got an answer. Just ignore the same thing.
I’m happy to help, but I need an answer or an interest in something.