Component to create PostProcessProfile that lives in the Scene. Useful for temporal profiles.

LocalPostProcessProfile.cs

using UnityEngine;
using UnityEngine.Rendering.PostProcessing;

[ExecuteInEditMode]
[RequireComponent(typeof(PostProcessVolume))]
public class LocalPostProcessProfile : MonoBehaviour
{
    [SerializeField, HideInInspector]
    private PostProcessProfile _profile;

#if UNITY_EDITOR
    private void Awake()
    {
        if (!Application.isPlaying)
        {
            if (_profile == null)
            {
                _profile = new PostProcessProfile();
                _profile.name = $"Local Profile: {gameObject.name}";
            }
        }
    }
#endif

    private void OnEnable()
    {
        TryAssignProfileToVolume();
    }

    private void TryAssignProfileToVolume()
    {
        if (TryGetComponent<PostProcessVolume>(out var volume))
        {
            volume.profile = _profile;
        }
    }

#if UNITY_EDITOR
    private void OnDestroy()
    {
        if (!Application.isPlaying)
        {
            DestroyImmediate(_profile);
        }
    }
#endif
}