extension. The extension should be a filename extension without the C<.>, for example C<txt> or C<json>.
The callback takes the L<Data::Section::Writable> instance as its first argument and the conte
ection::Pluggable> plugins listed here.
=head2 json
Automatically encode json into Perl data structures.
See L<Data::Section::Pluggable::Plugin::Json>.
=head1 PLUGIN ROLES
=head2 FormatContentPlu