No. Apple only provides an .app installer or a .pkg bundle. You must convert it yourself.
(requires admin password): sudo /Applications/Install\ macOS\ Catalina.app/Contents/Resources/createinstallmedia --volume /Volumes/Catalina --nointeraction Download Macos Catalina 10.15.7 Iso File
Convert the ISO to a raw image or use qm importdisk . Catalina runs beautifully on QEMU with OpenCore. security-focused architecture of today’s macOS versions.
Whether you are reviving an old MacBook or setting up a sandbox environment for coding, MacOS Catalina 10.15.7 provides a bridge between the classic Mac experience and the modern, security-focused architecture of today’s macOS versions. Download Macos Catalina 10.15.7 Iso File