Creating animations in the editor, manipulating children in glb files, triggering children with GSAP scroll trigger

If you are referring to animations similar to GSAP then no. However, you can create for each node in your scene graph a script that transforms object in arbitrary ways (and thus animate objects).

I suggest you create a script on the top-most glTF node and then query your glyph objects via Object3D.getObjectByName(). You should then be able to implement any object transformation you like.

I think this thread and the respective live example should help: Three.js + Gsap ScrollTrigger

But notice that it is not possible to include third-party scripts into the editor. If you need GSAP for animations, you have to copy the editor source into your project and implement a custom enhancement.