I suggested earlier that feeding the virtual GPS lists back into the GC.com website would allow interfacing. The official app only supports pocket queries to be downloaded into the app. As PQs can be generated from bookmark lists, it woudl be great (but is not yet possible) to transfer PGC lists/vGPS lists to bookmark lists on GC.com
The suggested workaround using GSAK or other tools is contradictory to the aim to have PGC as a web-bases solution replacing such tools.