I was playing with my smart controller recently and the HDMI out on the smart controller has options for the HDMI out to either mirror the display on the device or just to display the video feed without the OSD.You would need a device with HDMI such as the smart controller, and a pair of FPV goggles with HDMI in, then run a cable between them, its not true FPV as you will be mirroring the phone screen but its close enough, the other option is one of those phone head holders that put the phone in front of your eyes, again not ideal.
If Litchi supports the Air2 then their app offers an FPV mode which you can use with the aforementioned goggles
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