How to acces Depth Of Field Focus Distance through script in Post Processing Stack V2.

I try do do dynamic depth of field using Post Processing Stack v2, but i can’t acces Depth of Field Focus Distance through script. I don’t know how te set it’s value, I can’t find any answer in internet, and I can’t find answer in PPS v2 documentation.

Working code:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Rendering.PostProcessing;

public class DepthOfFieldController : MonoBehaviour
{
	private PostProcessVolume postProcessVolume;
	void Start()
    {
		postProcessVolume = GetComponent<PostProcessVolume>();
	}

    // Update is called once per frame
    void Update()
    {
		if (postProcessVolume)
		{
			DepthOfField pr;
			if (postProcessVolume.sharedProfile.TryGetSettings<DepthOfField>(out pr))
			{
				Debug.Log(pr.focusDistance.value);
			}
		}
	}
}