Fellies/kubejs/startup_scripts/items.js

events.listen('item.registry', function (event) {
  event.create('diamond_nugget').group('fellies').displayName('Diamond Nugget');
  event.create('graphite_one').group('fellies').displayName('Graphite 1');
  event.create('graphite_two').group('fellies').displayName('Graphite 2');
  event.create('graphite_three').group('fellies').displayName('Graphite 3');
});