I don't think so - at least not that I'm aware of. However, you might able to solve them problem elsewhere. For instance, if $x is the return value of a function, the function could check wantarray to see what the caller wants, i.e.

sub func {
   ...
   return (wantarray ? ($x) : [$x]);
}

my @arr = func(); # returns an array
my $arr = func(); # returns an array ref
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