您的json_decoded对象是Python字典；您只需在其中添加密钥，然后重新编码并重写文件即可：
import json
with open(json_file) as json_file:
json_decoded = json.load(json_file)
json_decoded['ADDED_KEY'] = 'ADDED_VALUE'
with open(json_file, 'w') as json_file:
json.dump(json_decoded, json_file)
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