use callback function which was set in colum->exportRender method to parse print + exports as expected (commit d48dc1bbe8bc860070240d6f1444e7a861c53789 in laravel-datatables-html)

Author: mrezagolestan

src/Transformers/DataArrayTransformer.php

@@ -52,7 +52,12 @@ protected function buildColumnByCollection(array $row, Collection $columns, stri
                     $data = is_array($data) ? json_encode($data) : $this->decodeContent($data);
                 }
 
-                $results[$title] = $data;
+                if(isset($column->exportRender)){
+                    $callback = $column->exportRender;
+                    $results[$title] = $callback($row,$data);
+                }else{
+                    $results[$title] = $data;
+                }
             }
         });