RPi4 + what else?

So this is the year 2021. I want to do an ambilight for a computer monitor, NOT for TV.
I have RPi4, WS2812B, POS-100-5-C (5VDC 18A). Do I need any other hardware? (Of course I also have the computer and computer monitor.)
Every project I find is outdated and require a lot items because they are designed to work with TVs.
Can anyone help me patiently with this, please?

Zitat von Paulchen-Panther

Operation System?

Raspberry Pi OS on RPi.
Windows 10 on computer.
Monitor is 42 inches 4K resolution.

Oh, this is excellent, I didn't know about the windows version of Hyperion. So that means it's gonna work with RPi4, it's just an overkill?