Add support for custom configuration file (https://docs.sdl.com/816112/745904/sdl-tridion-sites-9-5/creating-an-add-on-configuration-file) in UIEditor/UIModel extension points as there is for EventSystem.
Without this support add-on configuration file needs to be packed inside add-on extension and it produces multiple extension versions for different environments.
With add-on configuration file support, we will have one code base and multiple configuration files for different environments which is much easier to maintain.