Select Code to Download

use strict;
use warnings;
...
@{$hash_ref->{'Metadata'}}{ @array1 } = @array2;
@{$hash_ref->{'Submitted date'}}{ @array1 } = @array3;
print Dumper $hash_ref;

$VAR1 = {
          'Metadata' => {
...
                                'some_unique_key1' => 'submitted_date1
+'
                              }
        };