Kevin Bradley aka nitoTV, has just released the initial version of his eponymous tool, nitoTV for tvOS. NitoTV is a package manager and can install and remove packages on your Apple TV 4 or 4K,
It will require a jailbroken device beforehand so depending tvOS software version you may use
nitoTV says for tvOS 11 is in the pipeline and will eventually see the light of day. You can download the nitoTV tool today and see the procedure to install it HERE.