SwiftUI custom Transition thingy

ContentView.swift

//
//  ContentView.swift
//  TestTest
//
//  Created by Sandro Pennisi on 16.05.22.
//

import SwiftUI

struct WhateverModifier: ViewModifier {
    let height: Double

    func body(content: Content) -> some View {
        content
            .mask {
                Rectangle()
                    .frame(maxHeight: height)
            }
    }
}

struct ContentView: View {
    
    @State var expanded = false
    
    var body: some View {
        VStack(alignment: .leading) {
            Text("Hi I am some great cool text and I'm awesome. Hi I am some great cool text and I'm awesome. Hi I am some great cool text and I'm awesome. Hi I am some great cool text and I'm awesome. ")
            
            Button {
                expanded.toggle()
            } label: {
                Text("Tap me")
            }
            
            if expanded {
                Image("img")
                    .resizable()
                    .aspectRatio(contentMode: .fit)
                    .transition(.modifier(active: WhateverModifier(height: 0), identity: WhateverModifier(height: .infinity)))
            }
            
            Text("Hi I am some great cool text and I'm awesome. Hi I am some great cool text and I'm awesome. Hi I am some great cool text and I'm awesome. Hi I am some great cool text and I'm awesome. Hi I am some great cool text and I'm awesome. Hi I am some great cool text and I'm awesome. ")
        }
        .animation(.default, value: expanded)
    }
}