No, there's no such way.

while (...) {
  # these all initialized with undefined value
  my($you, $have, $to, $declare, $your, $variables, $one_by_one, $just
+_like_this);
}
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But, it's still not clear about what do you want to achieve by that. You can also use hash, and intialize all elements with empty or zero values.

my %hash = map { $_ => '' }
           qw(list of elements you want to initialize);
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