Stephen Harrod Buhner is a respected contemporary herbalist practicing shamanic herbalism. He is the author 23 books including, a personal favorite, Sacred Plant Medicine.
Here is a link to the a detailed article he has written discussing analysis and treatment of COVID 19. In it he mentions the use of Baikal Skullcap and other Traditional Chinese Medicine herbs.
FEAR NOT! WE HAVE HERBAL TREATMENTS FOR CORONAVIRUS