There are already several threads about this theme.
Actually the Mavic Mini, 
Mavic Air 2 and 
Mini 2 (all drones controlled by the Fly app instead of GO4) are not compatible with any 
DJI goggles and I am quite sure that this will not change in future, e.g. via firmware updates.
You can only hope for a new type of 
DJI goggles which is based on the Fly app interface.
Your other chance is using a third party app such as Litchi which supports a split screen view as required by Google Cardboard compatible 
goggles. The actual version of Litchi already supports the Mavic Mini and I like flying with it. Recently DJI has released a new SDK (software developers kit) supporting the 
Air 2, so the Litchi devs will soon support the 
Air 2 as well, as they depend on the SDK capabilities.
When checking the drone release dates and the SDK release dates for Mavic Mini and 
Air 2 it looks as if DJI usually needs about 6 months for supporting a new drone with their SDK, so you can estimate by yourself when there will be a Litchi version supporting the 
Mini 2.