You need to have Cheat Engine installed, then launch the game, open the table, attach it to the process and use the hotkeys:
F4 - activate the mod
F5 - reset FoV to default
F6 - Increase FoV
F7 - Decrease FoV
F8 - Set FoV to default +30°
Quick video to show the mod in action: https://streamable.com/2iosxc
If you set an offset too high or too low the camera will flip upside down, just press F5 to reset it.
In-engine cutscenes are also affected, things that weren't supposed to be in the shot may behave oddly.
Vehicle weapon crosshairs may be off-center (higher) when using higher FoV, just aim a bit higher than the actual target.