help getting checkbox checked

Hello i need some help making the checkbox checked, im using this code to insert the checkbox in the checkout on woocommerce. Somebody know what code can i use to make the checkbox checked?

// Our hooked in function - $fields is passed via the filter!
function custom_override_checkout_fields( $fields ) {
     $fields['billing']['mc4wp-try-subscribe'] = array(
    'label'     => __('Newsletter', 'woocommerce'),
    'type'=> 'checkbox',
    'required'  => false,
    'value' => '1',
    'class'     => array('form-row-wide'),
     );

     return $fields;
}

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