Can't run Marble QML examples

Question

I am trying to work with KDE Marble and I see this document.

import QtQuick 2.1
import org.kde.marble 0.20

MarbleWidget {
  projection: "Mercator"
  mapThemeId: "earth/openstreetmap/openstreetmap.dgml"
}

QML debugging is enabled. Only use this in a safe environment.

qt.qpa.qgnomeplatform.theme: The desktop style for QtQuick Controls 2 applications is not available on the system (qqc2-desktop-style).

The application may look broken. QQmlApplicationEngine failed to load component qrc:/main.qml:4:1: module "org.kde.marble" is not installed

I also can't run and test examples/qml/.

I use:

• Fedora 38
• Qt 5.15.10

I could build and install Marble, and its widgets work correctly, but I can't try its QML example.