You could use Data::Dumper::Perltidy which uses a default perltidy config, but can be configured to use your own .perltidy.rc:

perl -MData::Dumper::Perltidy -E'
$href = { foo => "bar", longer => "baz", longest => "qux" };
say Dumper $href;
'
[download]

Output:

$VAR1 = {
    'foo'     => 'bar',
    'longer'  => 'baz',
    'longest' => 'qux'
};
[download]

Hope this helps!