A Chinese review paper also mentions several favorable results from experiments in preventing or reducing the severity of infections by coronaviruses, specifically:

https://onlinelibrary.wiley.com/doi/10.1002/jmv.25707
Another overview of the role of vitamin C (ascorbate) in immune function:

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5707683/

Ascorbate levels are often depleted during acute infections.

Many studies also show marginally reduced symptom intensity and a lower probability of illness with adequate intake.
Another study, reference courtesy of @paulg via @rivatez, showing ascorbate efficacy in reducing the duration of mechanical ventilation: https://twitter.com/paulg/status/1244936140672598018?s=19
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