Move view to specific Item on ListView inside Flickable

[Adso4]

I have a Flickable, who has a Rectangle and a ListView inside (grouped in a ColumnLayout). This view has a ListView as delegate as well.
I need to be able to move the view position (flickable.contentY) to a specific index (of both ListViews). How can I get these coordinates? How can I map the Flickable.contentY coordinate to the position of a specific element in ListViews?

Imagine I have a ListView of Libraries (first ListView), where each element is a Library. Then, each Library has a ListView (second one) with all their books. I need to be able to move the Flickable to a specific book of a specific library.

The QML looks like:

Flickable {
    ColumnLayout {
        RectangleItem {}
            ListView {
                // Libraries
                model: //from C++
                delegate: Item {
                    // Books
                    ListView { //...
// ...
}