JME 3.3 loads it automatically by new animation system when loading a gltf models.
And for converting old models you can use this:
AnimMigrationUtils.migrate(model);
@ItsMike54 in case you like, you can also create a new blog post for this as well. Mostly you need to copy-paste what Nehon said, but please do not use the name “Monkanim”, just call it the new animation system.