[Gmsh] Help with an adaptive mesh (cube)

[x]

Hi users of Gmsh

I am trying to generate an adaptive mesh of a cube that has sidelengths
running from -1 to 1. The average tetrahedra-sidelength of a sphere with
radius 0.5 inside the cube is R1 and the remaining part of the cube has
resolution R2<R1. So basically a sphere within a cube, where I can vary the
two resolutions.

Is it possible to generate such a mesh in Gmsh? Any help will be greatly
appreciated. Thanks in advance.

Best,
x.
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