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You can create custom fields that create QRCodes with a code like this

return $Actions->QRCode("Text to transform to qrcode");

Since you can also retrieve the field information in the custom fields you could as well transform the field text into a qrcode like this:

$value= $Retriever->GetValueById('5');
if($value!=null)
  return $Actions->QRCode($value->GetHTML()->ToText());
return '';

Transform 5 with the id of your field (that you can find in the form builder or pdf builder).