The example is also using relative rotation.
Also is there a way to specify the
amount of rotations?
Look at the Lerp (rotator), the one with the one flip comment - it currently reads 360 - one flip, it should work with multiples of that just fine.
Since it was an example about using a timeline rather than lerping rotations, it is quite basic and does not currently account for non-360 rotations, but that can be added easily. Doing 540 is doable but the timeline will restart from 0 next time it executes; you’d need to store (modulo) final rotation before setting it as current rotation for the timeline.