Changing the end point of an in-flight transition animation

It's generally pretty easy to change the end point of an in-flight animation for a view that's on-screen by repeatedly mutating state:

withAnimation { state = ... }

var body: some View {
  ...
  child
    .opacity(state)
}

For a subview that is being removed, using the .transition modifier we have one chance to setup the endpoint like this:

disappearingChild
  .transition(
    .modifier(active: EndStateViewModifier(), identity: ...)
  )

struct EndStateViewModifier: ViewModifier {
  func body(content: Content) -> some View {
    content
      .opacity(0)
  }
}

Is it possible to change the end point mid way through the animation?