1. Install the Developer Extras
https://www.nexusmods.com/cyberpunk2077/mods/2972
2. You can use the Cyber Engine Tweaks (CET) of Ralfs CP2077 VR Mod, but you have to set a Hotkey Binding for your needs to open the ingame menu.
My Binding is the Button “End” on my keyboard in the bindings.json in the CET Folder
cet.overlay_key”: 9851624184872960
3. Modify the following shader in the ingame menu
Ambient Occlusion = off
Subsurface Scattering = off
Bloom = off
Screen Space Reflection = off
SSAO = off
Async Compute = off
Crowd SpawnLimit = 1
Fog (All) = off