[Feature]: Simulation on a custom mesh / around a custom obstacle

[sambaPython24]

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Is your proposal related to a problem?

I would like to simulate the flow around custom obstacles (fem meshes).
These custom obstacles could be created or loaded via an .obj file.

Describe the solution you'd like

I would like to be able to

From the documentation, I found that you can use an obstacle as

lt.Obstacle( context=context, resolution=[2 * ny, ny], reynolds_number=50.0,mach_number=0.05, domain_length_x=10.1, stencil=lt.D2Q9())

but it is not clear to me to which extend I can customize this obstacle in 2D and 3D.

Describe alternatives you've considered

Maybe creating a (2D, 3D) boolean mask of what is an obstacle could be interesting here.

Additional context

No additional context.