Talking to canada tax revenue , I found out you have to fill out Sch 7 , A and C.after that it will put the amount on line 20800 .
https://www.canada.ca/en/revenue-agency/services/forms-publications/publications/rc4177/death-rrsp-a...
And
https://www.canada.ca/en/revenue-agency/services/forms-publications/tax-packages-years/general-incom...
