currently available as a prototype in the 'nextrel' build (Release_2_8_2_Branch)
Enable chimera as the structure viewer by adding the line
to your ~/.jalview_properties before launching Jalview.
You'll also need to install chimera, and make sure Jalview can find it. Search paths are hardwired here:
Ideally, this routine would also search a set of user configured chimera paths (e.g. from jalview.bin.Cache.getDefault("CHIMERA_PATHS"))