Hi,
As mentioned above, you can not simultaneously use the Hyper-V role and VMware Workstation within the same Windows Server instance. However, you can run another instance of Windows Server on a Hyper-V virtual machine that can host VMware Workstation nested. That configuration may seem a bit complicated, but it is basically the only option to achieve what you want on the same piece of hardware.
While you may not get excellent performance with nested virtualization, it should be sufficient for testing/lab/learning purposes, which I assume is your case.
In order to easily migrate your virtual machines between two hypervisors, you may use a free V2V Converter: https://www.starwindsoftware.com/starwind-v2v-converter.
Best of luck with your virtualization projects!