QAccessible::Help Is Not Mapped to VoiceOver on Mac

QAccessible::Help is not being sent to VoiceOver on MacOS.
If you insert the following method in 'Qt/5.15.0/Src/qtbase/src/plugins/platforms/cocoa/qcocoaaccessibilityelement.mm', you can send QAccessible::Help to VoiceOver as accessibilityHelp.

- (NSString *) accessibilityHelp {
 QAccessibleInterface *iface = QAccessible::accessibleInterface(axid);
 if (!iface || !iface->isValid())
 return nil;
 if (iface->text(QAccessible::Help) != nil) {
 return iface->text(QAccessible::Help).toNSString();
 }
 return nil;
}

VO will automatically read the help message after a delay specified in VO setting.
Also you can read it manually with vo+shift+h.