my $hash = { base => { key => 'value', key2 => 'value2'}};

##</code><code>##

my $hash = {
  "value"   => [
    { 'chapter' => 2, 'paragraph' => 10 },
    { 'chapter' => 2, 'paragraph' => 11 },
   ...
  ],
  "value2" => [ 
    { 'chapter' => 3, 'paragraph' => 1 }
  ]
};