I don't own the BetaFPV LiteRadio 2 myself so I can't check, however, if you own the radio already there is a free version of FPV Freerider that you can try to see if it works without having to spend any money.
Download the free version: http://fpv-freerider.itch.io/fpv-freerider
edit 2021-03-26:
The internal input system has been completely reworked in the latest update. The betafpv literadio 2 should now work on Windows at least. However, it seems like the betafpv literadio 2 does not support joystick emulation on Android unfortunately.