Get forward tilt out of a gyroscope

Hello guys,

I have been breaking my head over this issue for days now and for some reason i dont seem to get the logic behind the problem.

Situation: I am trying to use a gyroscope in a situation where i have a phone laying flat on its back on the table in landscape mode (button right). The values i want to use are the pitch and roll but the heading is irrelevant. I want to be able to trigger "forward, backward" from using pitch and "Left, Right" from using roll.

Question: "How do i get a single value out of a forward tilt of my phone for pitch or roll. i.e. how can i read if the phone is tilted 30 degrees forward / backward / left / right?"

I have been using a plugin and writing some of my own code which always seem to require two values. i.e. the Roll factor and Pitch factor for a simple forward tilt. Shouldnt it be super simple to just get a Pitch rotation in degrees?

Thank you so much in advance.