How to use ‘Set Style’ in draw.io’s online tools ‘Create Custom Link’ to change ‘fillColor’?

I am using the online tool of Draw.io Create Custom Link to change a normal object such as a square’s fillColor. Where

  1. Action for Cell(s): Set Style; Key: fillcolor; Value: #ffe6cc
  2. Tags:ss
    push the Add Action button, you can get the code in Custom Link:
data:action/json,{
  "actions": (
    {
      "style": {
        "tags": (
          "ss"
        ),
        "key": "#ffe6cc"
      }
    }
  )
}

But this one do not work.