core/homeassistant/components/kitchen_sink/icons.json

{
  "options": {
    "step": {
      "options_1": {
        "sections": {
          "section_1": "mdi:robot"
        }
      }
    }
  },
  "services": {
    "test_service_1": {
      "service": "mdi:flask",
      "sections": {
        "advanced_fields": "mdi:test-tube"
      }
    }
  }
}