I want to add alembic track to Timeline by script

it’s somewhat like this in C#
var newTrack = timeline.CreateTrack<AnimationTrack>(null, "Animation Track ");
but that’s Animation track, seems like no alembicTrack type in UnityEngine.Timeline
or I missing something?
nb:I am using Maya 2018.3.7f1 and Alembic package v1.0
Alright I found it, it’s
UnityEngine.Formats.Alembic.Timeline.AlembicTrack