codeigniter : How to load two third party libraries using composer - $config[composer

I am using two third party libraries in codeigniter

(1) php spreadsheet (2) mpdf

libraries are installed by composer, path of spreadsheet

(project folder/vendor/...........)

path of mpdf

(project folder/vendorone/......)

if i set $config['composer_autoload'] = 'vendor/autoload.php'; then spreadsheet library working

& if i set $config['composer_autoload'] = 'vendorone/autoload.php'; then mpdf library working

but i wants to load both of these library as below e.g

$config['composer_autoload'] =array('vender1/autoload.php','vendor/autoload.php');

how is it possible?

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