In the process of developing a ReactJS webshop app with Webpack, I need to pull some shop configuration data from the backend in JSON format. This configuration includes a customCss property that is intended to override the CSS of my webshop app. Currently, I am utilizing CSS modules for styling, but it seems challenging to override CSS in this manner. Hence, I would like to know the most effective approach to managing CSS in my app and applying overrides dynamically using this customCss property.