Relations in osm2po

I'd like to use osm2po for a little bike routing planner. Is there a way I can mark those edges that are part of some national, regional or local bike network? It would be nice to give them a higher priority in the routing process as there are usually better for cycling than other roads..

As far as I can see, those bike networks are defined by tags and/or relations : http://ift.tt/1B16BfL