Fetching Data from Mysql and filling Inputs in a Form

[lexer]

Hi, I've got the following mysql table (expensemonthly):

I'm trying to fill inputs text in a form with the account_id (and account name fetch from another mysql table called "accounts"), for doing that from ajax code below I call a php file (CountFetchExpensesArrayDos.php) for creating a two dimention array:

//Count Registers and Fill Inputs
    $('#count').click(function(){ 
     
           $.ajax({  
                url:"CountFetchExpensesArrayDos.php", 
                method: 'POST',
                dataType: 'json',               
                data:{monthyear:"112021"},  
                success:function(data){
                    // array Receive
                        alert(data);
                        AddInputs(data.count);
                        alert("Se detectaron: "+data+" registros");
                        FillExpensesInputs(data.count,data.account_id,data.name);                                           
                    
              }  
           });  
        });

Below the CountFetchExpensesArrayDos.php file for getting data from the month (112021):

$Month = $connect->real_escape_string($_POST['monthyear']);
//Count number of month registers
$sqlc = $connect->query("SELECT * FROM expensemonthly WHERE yearmonth = '$Month'");
$count=$sqlc->num_rows;
    
if(! $connect ) {
    die('Could not connect: ' . mysqli_error());
}
         
//Get account_id and name for the month registers
$sql = "SELECT * FROM expensemonthly,accounts WHERE yearmonth = '$Month' AND accounts.account_id=expensemonthly.account_id";
$result = mysqli_query($connect, $sql) or die(mysqli_error($connect));
$final_array = array();
if (mysqli_num_rows($result) > 0) {
    while($row = mysqli_fetch_assoc($result)) { 
        $final_array[] = $row['account_id'];           
        $final_array[] = $row['name'];      
    }
    $CountArray[] = $count;
    //Merge Array with number of register for the month, account_id,name
    $Totalarray = array_merge($CountArray,$final_array);
    //Send array to ajax
    exit(json_encode($Totalarray));
} else {
    echo "0 results";
}
mysqli_close($connect);

My problem is that when data is arriving to ajax in an unknown format, If show data "alert(data);" I see it comma separated, but I cannot splitted using javascript "split() Method", I need to split data receive for filling Inputs in the form, this the data as received in ajax:

Please any Ideas? If is there another method to get data from month using php and pass it to Ajax?