Index Fields

Passes a value from 0 to 1 for each index. The main task of the node is to replace other fields when it is required to animate according to an ordered index.

Settings

Domain type – selection of the impact domain. Points are applied in the same way to instances.
Mode – In Half mode, the instances get only half the value and line up with a ladder, but in Full mode they go all the way from 0 to 1.
Factor– The slider is from 0 to 1. It is calculated as the number divided by 1. Thus, if you have 2 objects, then if the factor value is 0.5, then the index 1 will get the value 1.
Index Count – The number of indexes to influence.

The Colorramp or Float Curve is used to add softness or contrast to the values. You can also set different behaviors such as bounces

How to use
In action