Hi,
Cockpit is a common tool I install on my linux servers. I've been so impressed with docker support on LibreElec so far that I was fingers crossed on finding the cockpit addon. Unfortunately no joy! Google-fu only references this from lrusak but after that the trail seems to have gone cold.
For those who aren't away, cockpit is a very clean and well designed web admin/monitor for keeping tabs on your linux server resources and performing admin tasks (though thats less of an interest here). Perhaps there is not much in the way of enthusiasm for its inclusion but I figured I'd esquire nonetheless. At the least so someone else googling this see's an 'official' answer.
Cheers!
BE