Question [Global volume] - How to change individual RGB values in a channel mixer by script?

For example, I'd like to change the "red" value in a channel mixer. I managed to change the chromatic abberation intensity by script:

Code (CSharp):

1. CA.intensity.SetValue(new UnityEngine.Rendering.ClampedFloatParameter(caValue, 0, 1, true));

How do I set values for channel mixers?

 

By the way, for anyone wondering, here's a simple script that specifically changes chromatic abberation intensity.

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4. using UnityEngine.Rendering;
5. using UnityEngine.Rendering.Universal;
6.  
7. public class VolumeScript : MonoBehaviour
8. {
9.     [SerializeField]
10.     private Volume volume;
11.     private ChromaticAberration CA;
12.  
13.     private float caValue = 1f;
14.  
15.     void Start()
16.     {
17.         if (volume.profile.TryGet(out CA))
18.         {
19.             CA.intensity.SetValue(new UnityEngine.Rendering.ClampedFloatParameter(caValue, 0, 1, true));
20.         }
21.     }
22. }