Scripting the import of a moviefile (for animation-reference)

For an animated movie production I have to prepare 200+ Animate-projects. I want to do this automatically by using python

to process a list of scenes and then passing all the arguments to a function (with "fl.runScript(functionname, arguments etc...))

So far this all works, but what I cannot figure out is how to use the fljs-scriptlanguage to import a moviefile and place it on the timeline,

So that an animator can use this storyboard-moviefile as a reference.

I was thinking that something like this should work:

var doc =  fl.getDocumentDOM();

var libIndex = doc.library.library.findItemIndex("Sq080_sc210_sh020_animatic_v001");

var myLibItem = doc.library.items[libIndex];

fl.getDocumentDOM().getTimeline().layers[0].frames[0].element[0].libraryItem = myLibItem;

.. but i gives the error: "fl.getDocumentDOM().getTimeline().layers[0].frames[0].element[0] is undefined", which sounds logical.

..because the stage is empty(contains no elements)

How can I add an element to a frame(scriptwise) for linking it to my LibraryItem?

I searched all the contents of:

Adobe Flash Professional * Extending Adobe Flash Professional

But couldn't find anything.

Does anyone have the answer?