Feature request: keep trailing commas and maintain line placement of spread objects

[MarkPare]

Thanks for the great extension! Here are a couple of feature requests. Curious about feasibility and would happily contribute to get these in!

I think the trailing commas one is self-explanatory. Would be great if this was configurable.

For the line placement of spread objects, my issue is that

const myObject = {
  key1: {
    ...someOtherObject,
    a: 1
  }
}

turns into

const myObject = {
  key1: { ...someOtherObject,
    a: 1
  }
}

when ideally it would stay the same, with the spread object on its own line.