the SectionSelect is a custom made QML type built with basic Qt Quick Components. You can create your own section select in a similar way.
The main part is the SectionSelect::target, which refers to a ListView item of your application.
The SectionSelect can then build an internal model based on the ListView data, and provide UI mechanisms to set ListView properties and use functions for controlling the view.
You can for example use a Connections element to react to changes of ListView properties, e.g.: