This is the best answer I could find and it came from an article in the Washington Post:
Q: Do I have to return to work if I am pregnant or have a health condition that places me at higher risk if I am exposed to the coronavirus?
Try to obtain documentation from a health-care provider that you are especially vulnerable and at high risk, and that your health-care provider recommends self-quarantine. Once you have done that, your options include:
— asking your employer to grant you reasonable accommodations (such as alternative duties or temporary job-protected leave, for example) under the Americans With Disabilities Act.
— asking to be granted paid sick or emergency Family and Medical Leave under the Families First Coronavirus Response Act.
I hope htis helps, and that your employer is sympathetic. One good thing you could point out to them is that it benefitsthem to grant you this leave, so the non-use of payroll funds for your sake does not count against their PPP loan issues.
But notice that this does not help you maintain unemployment benefits! I have asked for a lawyer in that area, and will add to this response if (and notify you) if I learn anything helpful in that regard.