Determine if the values in each column are included in the text

import pandas as pd
df = pd.DataFrame(
    data = {
        'Context': ['Clear in Tokyo', 'Cloudy Kanagawa', 'Hot Okinawa Climate',
        Keywords: ['Fukuoka', 'Kanagawa', 'Okinawa']},
    index=['xx', 'yy', 'zz']
)
display(df)

#How do I determine if the values in each column are included in the text?
# Do I have to loop?I hope the pd.Series.str.contains() argument is Series.
print('◇Expected Results')
expired_df = pd.DataFrame(
    data = {
        'Context': ['Clear in Tokyo', 'Cloudy Kanagawa', 'Hot Okinawa Climate',
        Keywords: ['Fukuoka', 'Kanagawa', 'Okinawa',
        'Flag': False, True, True
    },
    index=['xx', 'yy', 'zz']
)
display(expanded_df)