Did you use specific Pay IDs in Payroll to pay the COVID wages? If so you may be able to use the reports in KB 103997 and/or 104105

Unfortunately no. Good idea.  I wish I had thought of that before! 

How were you able to assign a specific GL account to the absenses due to Covid? You may be able to use a time sheet report conditioning for the specific GL account that the time was distributed to.

Yes I did assigned a specific GL account but I can't find a condition for "time sheet" or "distribution" or anything similar.

I found my answer. In Payroll, reports>timesheet>applied an expense account condition for the GL account #