Unity Project

reference
https://cardgames.io/yahtzee/

Library/PackageCache/com.unity.timeline@1.2.15/Editor/treeview/TrackPropertyCurvesDataSource.cs

@@ -0,0 +1,15 @@
+using UnityEngine;
+using UnityEngine.Timeline;
+
+namespace UnityEditor.Timeline
+{
+    class TrackPropertyCurvesDataSource : BasePropertyKeyDataSource
+    {
+        protected override AnimationClip animationClip { get; }
+
+        public TrackPropertyCurvesDataSource(TrackAsset track)
+        {
+            animationClip = track != null ? track.curves : null;
+        }
+    }
+}