Nested virtualisation on Unraid

Hi, is there a neat way to enable nested virtualisation in UNRAID for AMD (Threadripper) in theory it should be possible as KVM allows it, I read (for a redhat distro) to insert in the file
the line
options kvm_amd nested=1
but I could not find a kvm.conf file in Unraid. Maybe there is a UI setting somewhere but I could not find it.
Why is it useful? to have a MacOs client with a parallels instance installed.

Thank you for any help provided.

You are probably going to want to pass it as a kernel parameter in the bootloader.

A quick search turns up this:

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