Squidex in AWS - question

Do you now how to change Squdex to read images from S3?
We need to check if the CMS image knows how to handle environment variables for the S3 bucket (if not we will need to rebuild the image with the script that modifies the appsettings.json file) - we need only 1 bucket for CMS. (https://github.com/Squidex/squidex/blob/master/backend/src/Squidex/appsettings.json )
How to change app setings ?

Have you read this: https://docs.squidex.io/01-getting-started/installation/configuration?