Parallels or (more recently) VMware Fusion. The problem is that, until now, the Arm version of Windows that runs on Apple Silicon Macs hasn't technically been allowed to run on anything other than Arm PCs that come with it due to Microsoft's licensing restrictions. That wouldn't be the case for Apple Silicon Macs, and there's really no good reason why Apple would spend the time and resources to develop and maintain alternate graphics, networking, and chipset drivers just so a handful of users could run a competitor's operating system