How do I output the passedthrough GPU to the Spice graphics adapter?

I have a VM in virt-manager and I passed through the NVME drive and a GPU but how do I pass the output of the GPU to the spice graphics adapter?

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I got it working with looking glass that I had to build but could not find another way to output the guest (VM) GPU to the host OS / GPU.
Means you would not need an extra monitor for the VM.

Vnc client like realvnc or tight vnc would do the trick.

Or a network streaming application like parsec

Both work well for me.