Cannabinoids may block some receptors and downregulate the production of some proteins in regard to an immune response to coronaviruses in general. There have been papers to see if cannabinoids could help since covid first became a thing.
Plenty of conflicting data so far, but it is an established fact that CBD is a powerful anti-inflammatory, so if it can be used to reduce any lung or airway inflammation in any patients, then there's that.