I don't know the answer to the question. However here's what I did out.
The latest official list from Unicode has 1719 different emojis including
approximately 100 just for faces with different expressions so I expect it
would be difficult to represent many of them with braille symbols let alone
to choose the appropriate one for a given situation.
https://unicode.org/emoji/charts/full-emoji-list.html
Best wishes though,
SusanJ
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