One time animation while scroll

Hi there,

I have an animation while scroll where page elements appear then disappear as you go through the full scroll. However I want this to occur only one time and once complete at 100%, freeze the animation and prevent the animation to run again if you scroll back up. In other words, at 100% I want to disable the animation while scroll. I attached a link below, the section I’m referring to is “Enchanting vintage watches”

Is this possible?

Here is my public share link: