Create simple landscape

Hey,

For a project I need to use unreal editor to create some custom scenarios that I can use in combination with MATLAB.
I have a flat landscape now, however I would also like a landscape that has some large flat hills like a sinusoidal wave with a maximum slope of around 4 degrees.

I have no idea how to make this and I’m not familiar at all with the unreal engine.
Could anybody help me with creating this landscape?

Thanks!