I am fairly new to web developing and JavaScript, but I want to know how cancustom widgets be added to Web Application after downloading Web AppBuilder. Creating custom widgets from scratch seems to be a pretty long process. Is it possible to add 3D widgets not included in the folder, but there is a JavaScript API reference about them. Can those widgets only be added to the Web Scene or can they be downloaded as a widget folder and added to the application as well? For example, ElevationProfile and LineOfSight.