Add Component Tracks To Sequencer Through Editor Utility Widget

Thank you, it’s very usefull.
I’m looking to automatically add Material Instance parameters in my sequence.
I’m able to create MovieSceneMaterialComponentMaterialTracks for
my SkeletalMeshComp but I don’t know how to add a section with the parameter name I want to edit in the sequence. How can I do that ?

Also, the track reference Element0 but if I create another track it also reference Element0, how can I get acces to Element1, 2, 3, …, 7?