Microsoft Entra External ID on Flask Mobile App

I would like to know how to integrate Microsoft Entra External ID into my Flask-based mobile app. Currently, the app uses custom authentication through Flask, and user credentials are stored in a table in a SQL Server database. An admin authorizes each user stored in the table with a flag column (0 or 1). Each authorized user also has private IDs that allow the app to retrieve useful information.

I would like to know if these app processes can be maintained with Microsoft Entra External ID, or if the code needs to be completely rewritten.