I'm very well aware that employment works very differently in the US than it does here in the UK, and that the safeguards in law and in common practice here don't exist where you are (and probably won't exist here for much longer either), but are you saying that you do not feel able to have a conversation with your boss that proceeds along the lines of 'As you know, I am in a vulnerable group, and would like to remain working from home until such time as it is safe for me to return full time'? Can you not at least pitch for reasonable accommodations (i.e. late start/early finishing, or only going in a couple of days a week; though this does not diminish risk, it might be able to help you better manage it)? I know it's not the same where you are, but I don't see how seeking to avoid the real and present risk of your own death makes you difficult.