interleukin‐6 level, lymphocyte count, C‐reactive protein level (cycle 1 and 2 every 12 hr), PaO2 (partial pressure of oxygen)/FiO2 (fraction of inspired oxygen, FiO2) ratio (or P/F ratio) (baseline, during treatment (cycle 1 and 2 every 12 hr), change of the SOFA (sequential organ failure assessment) (baseline, during treatment (cycle 1 and 2 every 12 hr), number of participants with treatment‐related side effects as assessed by Common Terminology Criteria for Adverse Event version 5.0, Radiological response, Time Frame: at baseline (optional), after 7 days and if clinically indicated, duration of hospitalization. Time Frame: from baseline up to patient's discharge, Remission of respiratory symptoms