Using MagnificationGesture; how can I zoom in to where a user's fingers actually “pinch”?

I am facing the same problem as below with SwiftUI.

Using PinchGesture; how can I zoom in to where a user's fingers actually "pinch"?

I think I can solve this problem by giving anchor parameter of scaleEffect the center coordinate of the two fingers. But I don't know how to get the center.

My Code:

import SwiftUI

struct MagnificationGestureView: View {
  @State var scale: CGFloat = 1.0
  @State var lastScaleValue: CGFloat = 1.0

  var body: some View {
    Image(
      systemName: "photo"
    )
    .resizable()
    .frame(
      width: 100,
      height: 100
    )
    .scaleEffect(
      self.scale
      //, anchor: <---- give: the two fingers center position
    )
    .gesture(
      magnification
    )
  }

  var magnification: some Gesture {
    // Can I get the center of the pinch?
    MagnificationGesture().onChanged { val in
      let delta = val / self.lastScaleValue
      self.lastScaleValue = val
      self.scale = self.scale * delta
    }.onEnded { _ in
      self.lastScaleValue = 1.0
    }
  }
}

Reference: https://stackoverflow.com/a/58468234/1979953