[Most Common ScrollTrigger Mistakes]

Heya @Blizzart!

No, nested would look like this...

A scrollTrigger both on a timeline, and on one or more of the tweens inside the timeline.
 

const tl1 = gsap.timeline({})
  .to('#jsScn23', 1, {
    top:'-200vh', 
    ease:Power1.easeInOut,
    scrollTrigger: {
      trigger: "#something",
      start: "top top",
      end: "+=500%",
    }
  })

  const scroll1 = ScrollTrigger.create({  
      trigger: "#jsScene1",
      start: "top top",
      end: "+=500%",
      animation: tl1
 });