Hello,
Yes, indeed, at the momen a manual installation is required (otherwise the images are incorrectly detected as x86). To perform it, please follow the steps below:
1. Open Parallels Desktop. Click New > Install Windows or another OS from a DVD or image file > Continue > Choose Manually > Continue without a source > Continue > Ok > Continue > Create.
2. Open the virtual machine's Configuration: click Parallels icon || > Control Center > right click on the virtual machine > Configure.
3. Click Hardware > CD/DVD > Source and browse to the installation .iso
4. Switch back to the virtual machine's Window and in the top menu click Actions > Reset.
5. Virtual machine shall boot from the installation image and let you proceed with installing the OS.