QML modules not installed in the snap

I’m trying to create a snap of a desktop QML application.

The creation/installation of the snap is working well using desktop-qt5, but the execution give:

Qt: Session management error: None of the authentication protocols specified are supported
QQmlApplicationEngine failed to load component
qrc:/qml/main.qml:2 module "QtQuick.Controls" is not installed
qrc:/qml/main.qml:5 module "Qt.labs.platform" is not installed
qrc:/qml/main.qml:3 module "QtQuick.Controls.Material" is not installed
qrc:/qml/main.qml:1 module "QtQuick" is not installed

Here is my snapcraft.yaml:

name: resizer
base: core18
version: '0.3'
summary: Batch image resizing
description: |
  Resize multiple images or folders in once specifing ratio or max size.

grade: devel
confinement: devmode

    command: desktop-launch $SNAP/usr/bin/resizer
# plugs: [desktop, x11]
# plugs: [unity7, x11, opengl, gsettings, home, network, network-bind, removable-media, raw-usb]

    source: https://github.com/lbaudouin/resizer-qml.git
    plugin: qmake
    qt-version: qt5
    after: [desktop-qt5]
      - build-essential 
      - qmlscene 
      - qt5-qmake 
      - qt5-default 
      - qtdeclarative5-dev
      - zlib1g-dev
      - libqt5widgets5
      - libqt5quickwidgets5
      - qtwayland5
      - libgl1-mesa-dev
      - libgl1-mesa-dri
      - libgl1-mesa-glx
      - libxkbcommon0
      - libqt5qml5
      - libqt5quick5
      - libqt5quickcontrols2-5
      - libqt5concurrent5
      - qmlscene
      - qtdeclarative5-qtquick2-plugin 
      - qml-module-qtquick-controls
      - qml-module-qtquick-controls2
      - qml-module-qt-labs-platform
      - qml-module-qtquick2
      - build-essential
      - qtbase5-dev
      - dpkg-dev
      - FLAVOR=qt5
    plugin: make
    source: https://github.com/ubuntu/snapcraft-desktop-helpers.git
    source-subdir: qt
      - libxkbcommon0
      - ttf-ubuntu-font-family
      - dmz-cursor-theme
      - light-themes
      - adwaita-icon-theme
      - gnome-themes-standard
      - shared-mime-info
      - libqt5gui5
      - libgdk-pixbuf2.0-0
      - libqt5svg5
      - try:
        - appmenu-qt5
      - locales-all
      - xdg-user-dirs
      - fcitx-frontend-qt5

What do I have to add in order to stage QML modules? Should I have to add plugs?
On Ubuntu installing qml-module-qtquick-controls2 package is enough.