如何在boost属性树中编写嵌套列表并将其转储为json？

#include <boost/property_tree/ptree.hpp>
#include <boost/property_tree/json_parser.hpp>

using namespace boost::property_tree;

ptree tree;

tree.put("list.item[0].name", "item1");
tree.put("list.item[0].value", 10);
tree.put("list.item[1].name", "item2");
tree.put("list.item[1].value", 20);

std::ostringstream oss;
write_json(oss, tree);
std::string jsonStr = oss.str();

{
  "list": {
    "item": [
      {
        "name": "item1",
        "value": 10
      },
      {
        "name": "item2",
        "value": 20
      }
    ]
  }
}