[godot][feature request] SkeletonRenderSeparator/SkeletonPartsRenderer nodes or alternative

[PonioFurr]

It would be very useful to have a functionality similar to Spine-Unity, allowing you to separate SpineSprite into several parts with different Z-indexes. Without this, it's very difficult to create complex and visually appealing character-character and character-environment interactions.
Some people recommend using SpineSlotNode, but it doesn't provide such functionality, it clearly has a different purpose.
Maybe it would be enough to add a Node similar to Unity's RenderExistingMesh with an option to disable some slots rendering?