On Nvidia video cards, there is currently no way to activate AMD upscaling or frame generation in the game, but by changing two lines in the game's .ini it is possible to activate it.

To Activate: Go To "C:\Users\(YouUser)\AppData\Local\BlueClient\Saved\Config\Windows" and edit the "GameUserSettings.ini" search and change the lines so they look exactly like these:

FSR3Value=4 (1=UltraPerformance 2=Performance 3=balanced 4=Quality 5=UltraQuality)
FSR3FI=True (Frame Interpolation/Generation)

It works on any Nvidia video card.

UPDATE: as some people reported in the comments, how to enable FSR Frame Gen with DLSS... I did a test and in addition to the better image quality, I gained 10 more frames. See which of the two options is better for you.

for this, the lines should be like:
DLSSValue=4 (1=UltraPerformance 2=Performance 3=balanced 4=Quality)
FSR3FI=True (Frame Interpolation/Generation)

(remember to set FSR 3 Value=0 if you are going to use this version and also make sure that DLSSG is False! "DLSSG=False")