If you don't mind having non-straight double quotation marks, then you can use CHAR(147) / CHAR(148) / CHAR(152)
Formula:
=CHAR(147)&"content"&CHAR(148)
will give
“content”
Formula:
=CHAR(152)&"content"&CHAR(152)
will give
˜content˜
Is that something you can work with?
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