Check out example codes for "how to edit postprocessing through script". It will help you in understanding the concepts better.

Code Example 1

using UnityEngine.Rendering;
using UnityEngine.Rendering.Universal;
 
var volume = target.GetComponent<Volume>();

if (volume.profile.TryGet<Bloom>(out var bloom))
{
    bloom.intensity.overrideState = true;
    bloom.intensity.value = 2f;
}

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