Accidental in parenthesize

[Alicuota618]

Hello and Happy New Year to all,

is there a way to parentesize an accidental-only like in the attachement?

This is \key a-minor (or whatever key that doesnt contain a c-sharp)
and should give a notice that the last repeat of refrain CAN be
c-sharp (picard third).

Thanks in advance,

Francois

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