If you mean the Alienware m17 R4 from a couple of years ago with 10th-gen processor, no you cannot. The CPU is soldered to the system board, so you cannot remove it. You would have to replace the system board with one including the Intel Core i9-10980HK.
I'm looking on Dell Alienware m17 R4 with i7-10870H. Is it possible to upgrade the CPU?
m17 R4, CPU upgrade from i7-10870H?