You can, all you need to do is to extract the widevine binary from a ChromeOS arm build and put them on your Pi/ARM board.

Admittedly, it's a bit cumbersome to do this, but it works very well. I've been watching Netflix on my Raspberry Pi 4 for over a year using it.

Also, according to this guy [0] you now seem to be able to just install libwidevine in Raspberry OS. I haven't tested this yet though.

[0]: https://lemariva.com/blog/2021/04/raspberry-pi-amazon-prime-...