不知道如何将数据输入 $data 变量,可以通过以下方式构造新数组:

$array = ['types' => []];

foreach ($data as $k => $v) {
   $array['types'][] = [
       'type' => $v->type,
       'count' => $v->count,
       'amount' => $v->amount
   ];
}

echo json_encode($array, JSON_PRETTY_PRINT);