Array as language_key

Hello.

Is it possible to use language_key as an array?

For example, my language file looks like this:

PHP Code:

$lang = array_merge($lang, [
    'DASHBOARD' => 'Dashboard',

    'DATETIME' => [
        'MONTH' => [
            'JANUARY' => 'January',
        ],
    ],
]); 


Can I fetch $lang['DATETIME']['MONTH']['JANUARY'] using Language Helper's function lang()? Or CodeIgniter doesn't support language_key as an array and I've to make my own function?

Thanks,
Vigo