After Emirates, only Etihad Airways has announced free COVID-19 insurance for all travellers. The Etihad insurance is valid for all tickets with travel dates up to the end of 2020, the Emirates insurance is currently limited to travel up to the end of October. You are covered for 31 days from the first flight on your ticket for quarantine and other medical costs, but not for PCR testing. Please refer to the websites linked above for detailed terms and conditions.