gltf nodes of entity in composition using meta spatial sdk

To be more clear, let's say that I have a clock face, and I want to set the time (see simplified gltf below).
How can I set the ShorterBar and LongerBar rotation dynamically?
The gltf is referenced in my composition.glfx. 

Note that in my real application, it not a clockface and I have multiple moving part in my gltf.

{
  "asset": {
    "version": "2.0"
  },
  "scene": 0,
  "scenes": [
    {
      "nodes": [0]
    }
  ],
  "nodes": [
    {
      "name": "Circle",
      "mesh": 0,
      "children": [1, 2]
    },
    {
      "name": "ShortBar",
      "mesh": 1,
      "rotation": [0, 0, 0, 1]  // Rotation quaternion for setting angle
    },
    {
      "name": "LongBar",
      "mesh": 2,
      "rotation": [0, 0, 0, 1]  // Rotation quaternion for setting angle
    }
  ]
}