json_normalize无法展平作为字典列表的列

import pandas as pd
from pandas.io.json import json_normalize

data = [
    {
        "name": "John",
        "age": 30,
        "cities": [
            {"name": "New York", "population": 8623000},
            {"name": "Los Angeles", "population": 3990000}
        ]
    },
    {
        "name": "Alice",
        "age": 25,
        "cities": [
            {"name": "San Francisco", "population": 883305},
            {"name": "Chicago", "population": 2720546}
        ]
    }
]

df = json_normalize(data, 'cities', ['name', 'age'])
print(df)