Nik Collection 4 by DxO, released on 02 June 2021, currently supports Apple M1 chip via Rosetta 2 emulation layer only. We have no further information regarding future compatibility at this time.
To have Nik Collection 4 by DxO show up in the current Photoshop 22.x or higher on your Mac M1 computer, please follow the steps from https://support.apple.com/en-us/HT211861:
Select Photoshop in the Finder.
From the File menu in the menu bar, choose Get Info.
Select checkbox “Open using Rosetta”