I've just purchased this one and it works perfectly:
https://www.amazon.co.uk/gp/product/B07DFWXTQT/
As mentioned above, you need to get hold of a simply passive adaptor that doesn't have a DAC. The problem is that nobody seems to specifically say if their adaptor is passive or active, so it can be tricky to know.
From what I can tell the Pixel seems to require a DAC, so I looked for adaptors that specifically say they do
not work with the Pixel. There seems to be lots of those, so I would assume that any of those will work with the Nova (Don't quote me on that though!).
Hope this helps someone!