The glb format supports multiple animations in one file and I have a simple play animation Action that controls which animation plays and switching animations. There is no 'tweening' between animations yet, but that's a natural next step.
If you want to see Babylon render similar to this addon, load a glb into this online Babylon viewer (allows for selecting of animations also.)
sandbox.babylonjs.com
Connect with me on the Construct Community Discord or Twitter (@kindeyegames), if you have models to test. It's still in the experimental stage, but it's interesting to play with.
Another example with simple light control.