将dict转换为嵌套列表，在每个子列表中插入关键字

def convert_dict_to_nested_list(dictionary, keyword):
    nested_list = []
    for key, value in dictionary.items():
        if isinstance(value, dict):
            nested_list.append([key, convert_dict_to_nested_list(value, keyword)])
        else:
            nested_list.append([key, value])
    nested_list.append([keyword])
    return nested_list

my_dict = {
    "key1": "value1",
    "key2": {
        "subkey1": "subvalue1",
        "subkey2": "subvalue2"
    },
    "key3": "value3"
}

nested_list = convert_dict_to_nested_list(my_dict, "keyword")
print(nested_list)

[['key1', 'value1'], ['key2', [['subkey1', 'subvalue1'], ['subkey2', 'subvalue2'], ['keyword']]], ['key3', 'value3'], ['keyword']]