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I just trial and error, referring to topic #91.
->pipe(new CalculatedColumn(array(
"1"=>array(
"exp"=>"'x <br/> y <br/> m <br/> n'",
"type"=>"string"
),
"2"=>array(
"exp"=>function($data){
return $data["amount_01"]."<br/>".$data["amount_02"]."<br/>".$data["amount_03"]."<br/>".$data["amount_04"];
},
"type"=>"string",
),
)))
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