Man pages matching name rdf::trine::serializer::rdfjson in section 3pm:

RDF::Trine::Serializer::RDFJSON.3pm.en	debian 10 / librdf-trine-perl
RDF::Trine::Serializer::RDFJSON.3pm.en	debian 11 / librdf-trine-perl
RDF::Trine::Serializer::RDFJSON.3pm.en	debian 12 / librdf-trine-perl