my @array;
foreach (0..2) {
        my $d = $data1->[$_];
        $d->{sizes} = $data2;
        push(@array,$d);
}
print Dumper(\@array);

$VAR1 = [
          {
            'food' => 'apple',
            'shape' => 'round',
            'sizes' => [
                         {
                           'small' => 'bunny',
                           'big' => 'cow'
                         },
                         {
                           'small' => 'mouse',
                           'big' => 'horse'
                         }
                       ]
          },
          {
            'food' => 'pear',
            'shape' => 'square',
            'sizes' => $VAR1->[0]{'sizes'}
          },
          {
            'food' => 'grape',
            'shape' => 'oval',
            'sizes' => $VAR1->[0]{'sizes'}
          }
        ];