Other financial discussions

How about this question for my wife?

Continue on last question: My wife also contributed to her 2020 ROTH was also returned. $5,000 contribution  was made in 2020 and $2000 was in 2/1/2021. Schwab said the earning for $5000 contribution is to be reported in 2020 Tax Return.   It takes days for Schwab to respond to a question. Another guy I talked to didn't understand the split. 

My question is : Assuming the total earing is $700.  That means the Total Return Distribution with gain made this year is $7,700.  I split the earing by  proportioning.  That is earning for 2020 & 2021 are  $500 and $200 respectively.

Then in her substitute  2020 1099-R  :  Is Box 1, Gross distribution $7,700 or $5,500 or $5,700 ?  As I believe Box 2  is $500 as $200 will be for 2021 Return.  The Box 7 code is also PJ, correct? Please advise.