IMG_0943.png

here's how it can be done in linq (from @Michael Landolfi)

{
  "type": "text",
  "value": "Hello world",
  "text_decorations": [
    {
      "range": [
        0,
        5
      ],
      "style": "bold"
    },
    {
      "range": [
        6,
        11
      ],
      "animation": "shake"
    }
  ]
}