datatables add dynamic data

Question

I have this simple php file which should handle an ajax request:

<?php

print_r($_POST['positionen']);

?>

If I do the request like this:

// This is the string of "myData": positionen%5B0%5D%5Bbezeichnung%5D=Anfahrt&positionen%5B0%5D%5Bmenge%5D=1&positionen%5B0%5D%5Beinheit%5D=Fahrt&positionen%5B0%5D%5Beinzelpreis%5D=10%2C00%20%E2%82%AC&positionen%5B0%5D%5Bgesamt%5D=10%2C00%20%E2%82%AC

$.ajax({
       url : 'ajax/myFile.php',
       type: "POST",
       data: myData,
       success: function (data) {  
         console.log(data);
       }
    });

I get this correct response:

Array
(
    [0] => Array
        (
            [bezeichnung] => Anfahrt
            [menge] => 1
            [einheit] => Fahrt
            [einzelpreis] => 10,00 €
            [gesamt] => 10,00 €
        )

)

Now I would like to send more data instead of only "myData". I tried this:

$.ajax({
       url : 'ajax/myFile.php',
       type: "POST",
       data: {
        myValue1: myData,
        myValue2: otherData
       },
       success: function (data) {  
         console.log(data);
       }
    });

Andy my response looks like this:

positionen%5B0%5D%5Bbezeichnung%5D=Anfahrt&positionen%5B0%5D%5Bmenge%5D=1&positionen%5B0%5D%5Beinheit%5D=Fahrt&positionen%5B0%5D%5Beinzelpreis%5D=10%2C00%20%E2%82%AC&positionen%5B0%5D%5Bgesamt%5D=10%2C00%20%E2%82%AC