Do I have to file Form 8949 for cryptocurrency?

I made a very few cryptocurrency transactions in 2020 and thus I didn't receive any 1099 form from Coinbase. I also sold stocks and receive 1099-B from my other broker. Total gains from my 1099-B from my broker I put in 1a, of Schedule D. The question is:

Can I add my total crypto gains to stocks gains and put everything in 1a, of Schedule D? OR... should I complete Form 8949 and fill crypto gains in Schedule D, point 3?