We have Construct 3 support on our roadmap. However, given how Construct 3 currently works, Spine support would be sub par. We aren't currently able to render meshes, only rectangles. The plugin SDK makes it very hard to support our multi-file exports (.json/.skel + .atlas/.png). We currently see no way to support Construct 3 properly. We've been in contact with Scirra a while ago, but I'm afraid that wasn't fruitful.
We'll keep Construct 3 on our roadmap. But for now we can not add support due to technical issues that are outside our control.
