Hi, the best practice way to do this (if the project is maintained well) would be to get the repository access, clone the project on your local machine and install it on your local AEM server. Once installed, you could check the OSGI configs on your local CRXDE Lite under apps/[project-name]/osgiconfig , they will be under runmode folders. Learn more about it here,
Also, OOTB OSGI configs that you configure through system/console/configMgr will be stored under apps/system/config.