How to authenticate with google smtp after receiving okta session token?

Questions API
1

i programmatically login into okta and upon success i get a reponse:

{'expiresAt': '2024-04-23T02:23:12.000Z',
 'status': 'SUCCESS',
 'sessionToken': 'MY SESSION_TOKEN,
 '_embedded': {'user': {'id': 'MY_USER_ID',
   'passwordChanged': '2023-12-03T18:00:39.000Z',
   'profile': {'login': 'MY_OKTA_LOGIN',
    'firstName': 'FIRST NAME',
    'lastName': 'LAST NAME',
    'locale': 'en_US',
    'timeZone': 'America/Los_Angeles'}}},
 '_links': {'cancel': {'href': 'https://myfirm.okta.com/api/v1/authn/cancel',
   'hints': {'allow': ['POST']}}}}

Then i can hopefully somehow use the session token to login into gmail to send some email

 smtp = smtplib.SMTP('smtp.gmail.com', 587)
    # smtp_server = smtplib.SMTP(server, port) # smtplib.SMTP_SSL('smtp.gmail.com', 465)
    
    smtp.ehlo()
    if use_tls:
        smtp.starttls()
    smtp.ehlo()
    smtp.login(username, password)

what value should i pass for user name and password ?