1. VM of VirtualBox
https://www.geekrar.com/install-macos-catalina-on-virtualbox-on-windows-pc/
Works great after installing Catalina VM. Xcode can connect iPhone12 and do debugging.
But weeks later, iPhone can’t be found by the VM. Googling and trying some workaround, failed.
2. VM of VMWare
https://amd-vm.hackintosh-guides.ml/

3. Xcode in app store in the latest one, 12.2, need Catalina 10.15.4 or later.
found Xcode 11.3.1 on https://developer.apple.com/download/more/
how to install Xcode from xip file? https://ladydebug.com/blog/2019/08/20/xcode-installation-from-xip-file/