Any Bahmni configuration can be overridden by creating a separate override file. That way, an implementation with multiple entities can have a standard master configuration and each entity will have the freedom to override specific parts
The above file will override the section "extensionPoints" in the the app.json file with the contents of the app.json file.
Make sure to have an alias for implementation_config is added to "ssl.conf" under /etc/httpd/conf.d directory. Ideally this will be coming from bahmni installer itself. If not, add a new line with "Alias /implementation_config /var/www/implementation_config" where all the aliases are added.