如何将Pandas数据输出到JSON，其中包含数组中的特定列

import pandas as pd

data = {'Name': ['John', 'Emma', 'Mike'],
        'Age': [25, 28, 30],
        'City': ['New York', 'London', 'Paris']}
df = pd.DataFrame(data)

selected_columns = ['Name', 'City']
df_selected = df[selected_columns]

df_selected.to_json('output.json', orient='records')

json_data = df_selected.to_json(orient='records')