Lauarvik

from types import SimpleNamespace

json_data =  {
            "name": "Terminal",
            "packageName": "application",
            "order": 20,
            "versionName": "1.37"
}

data = SimpleNamespace(**json_data)
print(data.name)
print(data.order)
#добавляем новое поле
data.new_field = "boo"
print(data)

Terminal
20
namespace(name='Terminal', packageName='application', order=20, versionName='1.37', new_field='boo')