Such approaches – known as RNAV (RNP) in the United States and RNP AR elsewhere – are filtered out (intentionally) by Working Title’s Garmin avionics. See for example:
The recent plugin updates only address the unavailability of some specific charts (and, more generally, the Navigraph plugins for the G3X/G1000/G3000 only add support for Navigraph Charts and Simbrief flight plan import, but do not affect the navigation functions of the avionics – including available approaches – in any way).
Regards,
Tim