How to set Range in a component?

So I'm working on a ParticleEmitter, and want to edit some of the properties in code.

However, the component fields are of type "Range" (which is not the same as "ut.Math.Range"),
which seems to be some JavaScript struct working with nodes and offsets.
These Ranges have a "start" and an "end" field in the inspector, which serve as a minimum and maximum between which the game randomly picks a value. I would like to set these fields,
but I don't know how.

The only methods to edit the start and end fields in code take some sort of node and offset parameters, which I have no idea how to use so that it translates to my desired start and end values.

The source interface of Range has these methods:

Code (CSharp):

1.     setEnd(node: Node, offset: number): void;
2.     setEndAfter(node: Node): void;
3.     setEndBefore(node: Node): void;
4.     setStart(node: Node, offset: number): void;
5.     setStartAfter(node: Node): void;
6.     setStartBefore(node: Node): void;

I also have no idea why the fields are stored in such a weird way when for example a Vector2 would've worked fine.

Anyone know how to set these values (or how to use the methods with node and offset)?