Genymotion SaaS and Genymotion Desktop do not support applications for aarch64/arm64, even with ARM translation tools.
However, we have recently released a Genymotion Device (PaaS) Android 8.0 (Oreo) image which runs on an ARM64 virtual machine at AWS and Oracle Cloud Infrastructure.
This image can run applications for arm (armv7) and arm64/aarch64 (armv8) "out of the box".
For more information, please refer to AWS Quickstart Guide and Oracle Cloud Infrastructure Quickstart Guide