Early withdraw of 401K due to COVID-19, where to enter on TT and what forms are required, what are the tax impacts, can this be spread across 3 years if so, how?

Just recently withdrew funds from my 401K account before my retirement age due to COVID. What proof do I need to show to the IRS if any for COVID related reasons? How do I spread the penalty across 3 years? How do I recognize the income, all in 2020? or spread throughout? What happens when I pay it back how do I record it after my 2020 tax return?