How to watch all Freeview channels on Google TV?

I've recently bought a CCWGTV 4k and loving it. I am having trouble though to get Freeview channels including PrimeTV on it. There is a Freeview app but that's not for CCWGTV. There are separate apps for TVNZ and Skygo (for prime) but that's not what I want, I want a single app.

I also have a Vero 4k (Kodi) and works like a charm there with Matt Huismans plugin. I tried the same with the Kodi Android app but ran into buffering issues. But, trying to replace the Vero with CCWGTV, this is the last hurdle. It should be easier right to watch all NZ Free to air channels in one app on Android / Google TV?