Magento OAUTH/Token/Session based login from external Application

We have a website is Drupal and another website in Magento 2. In Magento we have added mageplaza social media login - login from facevok, Google, etc. That works wonderful! Requirements: We want the LOGIN BY DRUPAL code. so that we can login to Magento 2 via Drupal username/passwords. (Same like Login by Google popup). Some References: [login to view URL] [login to view URL] (oauth or token or session based) Let me know the solution. We want the button in Magento saying "LOGIN FROM DRUPAL". Click on it, open a popup... consume oauth/token/session to get authenticated and login to Magento2.