Cooked mods are compressed, encrypted and obscured. They cannot be modified/read after they have been cooked, and furthermore after uploading.
Approach the mod developer and ask if they’d be willing to open up the values you want to modify, if they can be modified for how the mod is set up, using the Get Option nodes(which allows Integers, Floats and Booleans for mods to be defined through the GameUserSettings.ini file upon run-time/load) in the DevKit.
-WM