If your Nvidia DLSS or Frame Generation options are missing, try this fix.
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Changelogs
Version v1.3
Fixed a few coding bugs.
Version v1.2
Further code optimization and revision, added support for the non-Steam version and custom path.
Version v1.1
Revised the code.
Version v1.0
Initial release.
Workaround for Missing Nvidia DLSS/Frame Generation
Method 1 Disable Steam Input.
or Method 2
Quit the Ubisoft Connect launcher from the system tray.
Relaunch the game through Steam
I've noticed that if I start the game in Steam (which also launches Ubisoft Connect), then exit and try to relaunch it, the DLSS options disappear. Restarting Ubisoft Connect resolves the issue.