I am in the same predicament so I looked a bit deeper... I found on page 5 of the IRS' Instructions for Form 8949 (2020) which says:
"Stock acquired on various dates. If you
sold a block of stock (or similar property)
that you acquired through several different
purchases, you may report the sale on one
row and enter “VARIOUS” in column (b).
However, you still must report the
short-term gain or (loss) on the sale on
Part I and the long-term gain or (loss) on
Part II."
I hope this helps.
