$ corelist -v 5.38.0 >corelist.tmp
$ wc -l corelist.tmp
649 corelist.tmp

$ grep -i JSON corelist.tmp
JSON::PP                                     4.16
JSON::PP::Boolean                            4.16

$ grep -i YAML corelist.tmp
CPAN::Exception::yaml_not_installed          5.5
CPAN::Exception::yaml_process_error          5.5
CPAN::Meta::YAML                             0.018
TAP::Parser::Result::YAML                    3.44
TAP::Parser::YAMLish::Reader                 3.44
TAP::Parser::YAMLish::Writer                 3.44