Hi BJS developers, cc @julien-moreau
I found Babylon.js Editor has fantastic updates as v4. It is still beta, but it worth to try.
The following blog post introduce basic usages of Babylon.js Editor v4 and provides a sample game repo developed by the editor. Hope it will works for developers.
https://www.crossroad-tech.com/entry/babylonjs-editor-v4-introduction-en