There are a few workarounds that you can use to play the game on your desktop.
One option is to use an Android emulator such as Bluestacks or GameLoop. These emulators allow you to run Android apps on your PC. To play Call of Duty: Mobile on an emulator, you will first need to download and install the emulator. Once the emulator is installed, you can download and install Call of Duty: Mobile from the Google Play Store.
Another option is to use a cloud gaming service such as now.gg. Cloud gaming services allow you to stream games to your device without having to install them. To play Call of Duty: Mobile on a cloud gaming service, you will need to create an account and find the game in the library. Once you have found the game, you can click the play button to start streaming.