PieSlice should be able to contain Animation

PieSlice {
  NumberAnimation {} // not allowed
}

PieSeries {
  NumberAnimation { // has to be here
    target: slice1
    property: "explodeDistanceFactor"
    from: 0; to: 0.2
    duration: 500
    running: true
    loops: -1
  }
  PieSlice {
    id: slice1
    value: 1
    exploded: true
    // ideally, a user wants to write Animations for slice1 here
  }
  PieSlice {
    id: slice2
    value: 2
  }
}