There is no easy way to do that. If you have desktop TT software, for those years, you can re-enter and redo each return for an accurate calculation.
" I didn't put in my stock investments when filing 2021 and 2020 tax forms". That sounds like you may need to do amended returns for those years. The deadline for amending 2020 is 4-15-24. The amended returns should do the carry forward calc.
How to amend https://ttlc.intuit.com/questions/1894381-how-to-amend-change-or-correct-a-return-you-already-filed
You may have to go to a tax pro to get this straightened out.
