Unreceived 2019 refund: enter as payment on 2020 return?

[woo0]

For 2019, I filed for an extension in July 2020 (paper), then filed the 1040 in Oct. 2020 (paper).  I was owed a large (>$8k) refund, and specified direct deposit (acct. info is correct).  Refund has not been received.  I was sent a letter from IRS in March 2021 saying they needed more time to "process your claim."  Can I just record the amount as a payment on my 2020 return, even though I requested the refund?  Is there another form I should file first? 

[woo0]

FYI: the IRS2go app will only deal with 2020 refunds, not prior years.

[MinhT1]

Refunds from your 2019 tax return (either received or not received) are not reported at all on your 2020 tax return).