I take some hope from this article, even though lungs are not brains. I do this research for a family member who has post-COVID neurological issues.
Some Signs of Recovery From Severe Covid Lung Damage - The New York Times
Doctors at Mount Sinai found that Covid doesn’t break down the lung’s blood vessels but rather dilates them, which makes the blood flow too fast for the oxygen to be absorbed, causing hypoxemia or low levels of oxygen in the blood.