How to modify toml file in cpp (TOML++)

I am using toml++. How can I modify a particular value of a TOML file in CPP using toml++

json ConfigService::getAllData(std::string filePath)
{
    try
    {
        auto _data_table = toml::parse_file(filePath);
        _data_table["config_paths"]["DIAAI_core"] = "diaaiSetting.toml";  # this is not working
        cout << _data_table << endl;
    }
    catch (const exception err)
    {
        std::cerr << "Parsing failed:\n"
                  << err.what() << "\n";
        std::runtime_error(err.what());
    }
}

traceback

error: no match for ‘operator=’ (operand types are ‘toml::v3::node_view<toml::v3::node>’ and ‘int’)
   51 |         _data_table["config_paths"] = 1;