Currently, I am using multiple Texts in a horizontal stackview, to achieve animation of substring.

I am new to iOS development and I have been working on a project using SwiftUI. I have a sheet where I can buy or sell some stocks. On successful transaction, I am supposed to show a green screen with success message. The problem is that my implementation just shows the green screen suddenly as opposed to it being animated/faded in. Here is what I mean:
This is the way my app behaves and this is how I want it to behave.