I've made today an FOV changer for Atomic Heart. You can find it below and will need Cheat Engine to run it of course. It's not a perfect solution as aiming for example won't give an FOV zoomed, but at least you can play with a bigger FOV.
Enjoy!
How to use this cheat table?
Install Cheat Engine
Double-click the .CT file in order to open it.
Click the PC icon in Cheat Engine in order to select the game process.
Keep the list.
Activate the trainer options by checking boxes or setting values from 0 to 1
FOV change working. Scanner highlights are off - higher FOV more distance in scanner vs real. Moving with opened scanner create ever bigger distance difference of highlight. Zoom in with weapons doesnt work at all.