How add repeater area field to custom email body?

Hello, I have form like the picture below:
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I want create custom email body, but I don't know, how add repeater area to it. Please help me🙂
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Hi Webpiksel,
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I would use a Custom PHP action before the Email action to loop through the Repeater data, build the HTML to display it and save that to the form data as a new item. Then you can display that whole item in the Email Body.
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Bob

I wrote simple php code like this:

for ( $i=0; $i<10; $i++ ) {
  $nazwa = "rodzaj{$i}";
  $nazwa2 = "ilosc{$i}";
  if (!empty($_POST[$nazwa]) ) {
    $wynik .= 'Rodzaj auta: <strong>'.$_POST[$nazwa].'</strong><br/>';
    $wynik .= 'Ilość: <strong>'.$_POST[$nazwa2].'</strong><br/>';
  };
};

How put $wynik to email body?

It's works!
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Thank you for your help!!