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my %hash = (
   foo => 2,
...
);

my @array = sort {$hash{$a} <=> $hash{$b}} keys %hash;

my @array_of_hashes;
push @array_of_hashes, {key => $_, value => $hash{$_}} for @sorted;

use Data::Dumper;
print Dumper(\@array_of_hashes);

$VAR1 = [
          {
...
            'key' => 'baz'
          }
        ];