drupal 8 ajax multiple callbacks

 $form('elements')  ('#ajax') =array(
            "callback" => (first_callback,second_callback),
            "event" => "change",
            "effect" => "fade",
         );

 function first_callback(array &$form, FormStateInterface $form_state) {
   return action;
}

function second_callback(array &$form, FormStateInterface $form_state){
  return second_action;
}

How to callback more than one function in the above example.
I have two conditions and from one callback or two callback, I want to change both of them value.

1.alter text value (text_1)
2. alter next text value (text_2)

The problem is only one callback is working.

I use this method also

$form('elements')  ('#ajax') =array(
            "callback" ="callback_me"),
            "event" => "change",
            "effect" => "fade",
         );

 function callback_me(array &$form, FormStateInterface $form_state) {
   return array($one_conditon_text_1,$two_condition_text_2);
}

But it’s doesn’t work.