my $key_ordering = [8, 1, 5, 3, 9];
my $data = [
    {key => 1, name => 'label4'},
    {key => 3, name => 'label2'},
    {key => 5, name => 'label5'},
    {key => 8, name => 'label1'},
    {key => 9, name => 'label3'}
];