DOTSSample/Assets/Scripts/Utils/Timeline/ScreenFaderClip.cs

using System;
using UnityEngine;
using UnityEngine.Playables;
using UnityEngine.Timeline;

[Serializable]
public class ScreenFaderClip : PlayableAsset, ITimelineClipAsset
{
    public ScreenFaderBehaviour template = new ScreenFaderBehaviour();

    public ClipCaps clipCaps
    {
        get { return ClipCaps.Blending; }
    }

    public override Playable CreatePlayable(PlayableGraph graph, GameObject owner)
    {
        var playable = ScriptPlayable<ScreenFaderBehaviour>.Create(graph, template);
        return playable;
    }
}