ASP.NET Core has an flexible and extensible key-value based configuration system. In fact, the configuration system is a part of Microsoft.Extensions libraries and it is independent from ASP.NET Core. That means it can be used in any type of application. See Microsoft's documentation to learn the configuration infrastructure. ABP framework is 100% compatible with the configuration system.
Thank you for your valuable feedback!
Please note that although we cannot respond to feedback, our team will use your comments to improve the experience.