This is listed on EBay and lists VW T Cross as able to be fitted to. Not got it on mine but looks like it's doable, at a price though compared to my next base 412g but that's forward facing only.
https://www.ebay.co.uk/itm/223683268035

 

Yep, that's the fella. It's also listed on Amazon https://www.amazon.co.uk/Volkswagen-000063511E-Universal-Traffic-Recorder/dp/B07S5BK1SJ but as with a lot of things listed on Amazon it's currently unavailable.

Price fitted according to VW is a whopping £595 https://www.volkswagen.co.uk/owners/accessories-and-merchandise/top-products looks very neat. My dealership are offering a next base 512GW front and rear dash cam for £359 fitted.... I'm still thinking what option to go for

 

I have a nextbase duo hd i fitted to my current car,,,, ill be removing it and fitting to the t cross On arrival.
I find the rear camera Feed fine for playback with Number plates readable if needed.

Easy enough to fit just feeding cable around Trim. My cars havent moved without a camera for years. Invaluable so much thats it should be factory fit by now

 

I have also used nextbase duo hd for a number of years and it is easy to move between cars if required The evidence from it has been used in a successful insurance claim. I like the look of the VW system but cost counts against it compared to what I'm currently using..