[MacOS] Context menus do not follow system style.

Qt applications do not use native system style for QMenu popup, as it is described in Qt documentation:
The Aqua style is an essential part of the macOS platform. As with Cocoa, Qt provides widgets that look like those described in the macOS Human Interface Guidelines.

It is not highly noticeable on Mac OS 10.15 Catalina and lower, but on Mac OS 11 Big Sur it became very prominent (See attached screenshots). This reduces the user experience on Mac OS devices.

Also, I would appreciate it if you can advise me on any workarounds to overcome these difficulties.