wasm: app with QtVirtualKeyboard does not build

error: undefined symbol: _Z61qt_static_plugin_QtQuick_VirtualKeyboard_Styles_BuiltinPluginv (referenced by top-level compiled C/C++ code)

FAILED: appwasm-vkbd-cmake.js 
: && /Users/lpotter/emsdk/upstream/emscripten/em++ -g -s EXPORTED_RUNTIME_METHODS=UTF16ToString,stringToUTF16 -s INITIAL_MEMORY=50MB -s ERROR_ON_UNDEFINED_SYMBOLS=1 -s MAX_WEBGL_VERSION=2 -s FETCH=1 -s WASM_BIGINT=1 -s MODULARIZE=1 -s EXPORT_NAME=createQtAppInstance -s DISABLE_EXCEPTION_CATCHING=1 -s ALLOW_MEMORY_GROWTH=1 -s DEMANGLE_SUPPORT=1 -s GL_DEBUG=1 --profiling-funcs /Users/lpotter/development/builds/qt6/qtbase/src/plugins/tls/certonly/CMakeFiles/QTlsBackendCertOnlyPlugin_init.dir/QTlsBackendCertOnlyPlugin_init.cpp.o /Users/lpotter/development/builds/qt6/qtbase/src/plugins/imageformats/gif/CMakeFiles/QGifPlugin_init.dir/QGifPlugin_init.cpp.o /Users/lpotter/development/builds/qt6/qtbase/src/plugins/imageformats/ico/CMakeFiles/QICOPlugin_init.dir/QICOPlugin_init.cpp.o /Users/lpotter/development/builds/qt6/qtbase/src/plugins/imageformats/jpeg/CMakeFiles/QJpegPlugin_init.dir/QJpegPlugin_init.cpp.o 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/Users/lpotter/development/builds/qt6/qtbase/lib/libQt6BundledPcre2.a -lembind && :
error: undefined symbol: _Z61qt_static_plugin_QtQuick_VirtualKeyboard_Styles_BuiltinPluginv (referenced by top-level compiled C/C++ code)
warning: Link with `-sLLD_REPORT_UNDEFINED` to get more information on undefined symbols
warning: To disable errors for undefined symbols use `-sERROR_ON_UNDEFINED_SYMBOLS=0`
warning: __Z61qt_static_plugin_QtQuick_VirtualKeyboard_Styles_BuiltinPluginv may need to be added to EXPORTED_FUNCTIONS if it arrives from a system library
Error: Aborting compilation due to previous errors
em++: error: '/Users/lpotter/emsdk/node/14.18.2_64bit/bin/node /Users/lpotter/emsdk/upstream/emscripten/src/compiler.js /var/folders/n4/qrpzb2x93hl6gfbdhvk9_hm40000gn/T/tmpvutoh33x.json' failed (returned 1)
ninja: build stopped: subcommand failed.