I have read that the wheel's camber angle changes when suspension gets more compressed. I thought of it being like this:

camber_angle = suspension_compression * c

Where c is camber-angle changing coefficient.

However, I don't know if this is correct in any way.

I also don't know what may be some possible values for the c.

What is the true in this case?

the change in camber angle will depend on the type/geometry of the suspension. it is generally not linear.

OK! Could you give me some examples? I need some sort of integral equations that I can use in game.

https://en.wikipedia.org/wiki/Double_wishbone_suspension

https://en.wikipedia.org/wiki/MacPherson_strut

https://en.wikipedia.org/wiki/Suspension_(vehicle)#Suspension_geometry