You can add the to the vgps and create a GPX there. It is a paying member function.
There is no way to add data from pgc to a bookmark list directly. The metod i have used is to create a vgps. export to gpx och csv and import in GSAK and add to bookmars from there.
PQ are a gc.com fearure and can be only created on that site but vgs can replace them in many cases