QVariant::fromValue fails with std::unordered_map

#include <QString>
#include <QVariant>

#include <unordered_map>

class Person
{
};

int main(){
    std::unordered_map<QString, Person> container;
    QVariant::fromValue(container);
} 

[1/2] Building CXX object CMakeFiles/foo.dir/main.cpp.o
FAILED: CMakeFiles/foo.dir/main.cpp.o 
/usr/lib64/ccache/c++ -DQT_CORE_LIB -DQT_NO_DEBUG -isystem /home/nico/workspace/maptets/build/foo_autogen/include -isystem /home/nico/kde/usr/include/QtCore -isystem /home/nico/kde/usr/include -isystem /home/nico/kde/usr/mkspecs/linux-g++ -isystem /home/nico/kde/usr/include/KF6/KTextTemplate -fPIC -MD -MT CMakeFiles/foo.dir/main.cpp.o -MF CMakeFiles/foo.dir/main.cpp.o.d -o CMakeFiles/foo.dir/main.cpp.o -c /home/nico/workspace/maptets/main.cpp
In file included from /home/nico/kde/usr/include/QtCore/qvariant.h:12,
                 from /home/nico/kde/usr/include/QtCore/QVariant:1,
                 from /home/nico/workspace/maptets/main.cpp:2:
/home/nico/kde/usr/include/QtCore/qdebug.h: In instantiation of 'QDebug QtPrivate::printSequentialContainer(QDebug, const char*, const SequentialContainer&) [with SequentialContainer = std::unordered_map<QString, Person>]':
/home/nico/kde/usr/include/QtCore/qdebug.h:457:47:   required from 'QDebug operator<<(QDebug, const std::unordered_map<_Key1, _Tp1, _Hash1, _Pred1, _Alloc1>&) [with Key = QString; T = Person; Hash = std::hash<QString>; KeyEqual = std::equal_to<QString>; Alloc = std::allocator<std::pair<const QString, Person> >]'
  457 |     return QtPrivate::printSequentialContainer(std::move(debug), "std::unordered_map", unordered_map); // yes, sequential: *it is std::pair
      |            ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/nico/kde/usr/include/QtCore/qmetatype.h:2362:11:   required from 'static void QtPrivate::QDebugStreamOperatorForType<T, <anonymous> >::debugStream(const QtPrivate::QMetaTypeInterface*, QDebug&, const void*) [with T = std::unordered_map<QString, Person>; bool <anonymous> = true]'
 2362 |     { dbg << *reinterpret_cast<const T *>(a); }
      |       ~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/nico/kde/usr/include/QtCore/qmetatype.h:2522:33:   required from 'QtPrivate::QMetaTypeInterfaceWrapper<std::unordered_map<QString, Person> >::InterfaceType QtPrivate::QMetaTypeInterfaceWrapper<std::unordered_map<QString, Person> >::metaType'
 2522 |     static inline InterfaceType metaType = {
      |                                 ^~~~~~~~
/home/nico/kde/usr/include/QtCore/qmetatype.h:2625:12:   required from 'constexpr const QtPrivate::QMetaTypeInterface* QtPrivate::qMetaTypeInterfaceForType() [with T = std::unordered_map<QString, Person>]'
 2625 |     return &QMetaTypeInterfaceWrapper<Ty>::metaType;
      |            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/nico/kde/usr/include/QtCore/qmetatype.h:2661:61:   required from 'static constexpr QMetaType QMetaType::fromType() [with T = std::unordered_map<QString, Person>]'
 2661 |     return QMetaType(QtPrivate::qMetaTypeInterfaceForType<T>());
      |                      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~
/home/nico/kde/usr/include/QtCore/qvariant.h:579:47:   required from 'static std::enable_if_t<((bool)(is_copy_constructible_v<T> && is_destructible_v<T>)), QVariant> QVariant::fromValue(const T&) [with T = std::unordered_map<QString, Person>; std::enable_if_t<((bool)(is_copy_constructible_v<T> && is_destructible_v<T>)), QVariant> = QVariant]'
  579 |         return QVariant(QMetaType::fromType<T>(), std::addressof(value));
      |                         ~~~~~~~~~~~~~~~~~~~~~~^~
/home/nico/workspace/maptets/main.cpp:12:24:   required from here
   12 |     QVariant::fromValue(container);
      |     ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~
/home/nico/kde/usr/include/QtCore/qdebug.h:358:15: error: no match for 'operator<<' (operand types are 'QDebug' and 'const std::__detail::_Node_const_iterator<std::pair<const QString, Person>, false, false>::value_type' {aka 'const std::pair<const QString, Person>'})
  358 |         debug << *it;
      |         ~~~~~~^~~~~~