Read Only Output Directory of Cap’n Proto Module

I need to adjust it to put outputs somewhere else, and currently, I have to copy & carry the entire module only to be able to modify that property.

In: https://github.com/qbs/qbs/blob/master/share/qbs/modules/capnproto/capnprotobase.qbs#L43

I could inherit "CapnProtoBase", but I think there is no way to import it without mentioning "qbs_path/share/qbs/modules/capnproto/cpp/capnprotobase.qbs" explicitly, and the same for the js helpers right?