minecraft-bedrock-json-schemas/source/resource/ui/elements/properties/toggle_default_state.json

{
  "title": "Toggle Default State",
  "description": "The default state of the toggle.",
  "anyOf": [
    {
      "enum": ["checked", "unchecked"]
    },
    {
      "$ref": "../../general/item_ref.json"
    }
  ]
}