A gap in employment due to COVID-19 doesn’t need to be accounted for.
Time off before the pandemic–before March 2020–can be talked about.
It helps to have done volunteer work, learned computer skills, or otherwise been active during the time you weren’t working.
Even caring for an ill family member is a justified reason for a gap.
Should you have a mental illness and not have been doing anything while unemployed:
Doing volunteer work and better yet volunteer work linked to the job you want to get can help.
Doing an unpaid internship while you’re collecting government disability benefits makes sense too.
Log on to Idealist or VolunteerMatch or Internships for search options.