https://www.nature.com/articles/s41577-020-00436-4
Not just antibodies: B cells and T cells mediate immunity to COVID-19
this article has no bearing on COVID but does show how ferritin can affect those certain cells.
https://jprsolutions.info/files/final-file-5ec958f16ddfa0.73615335.pdf
The Lung Dr who got this early on and had to be hospitalized had insane Ferritin levels. The article about him was either on Slate or Salon.
If T cells are the key then the cancer MABs like Keytruda and Yervoy might be key. Though they are expensive. Yervoy can be $80K a dose, though the dose required for COVID might be far smaller than for melanoa.