Generate a non conforme mesh using toughio ?

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Hi Kerfonluu,
Thank you for all the direction and for your answers.

I have aquestion can we generate a non-conform mesh as shown in the attached image without using pygmsh.
For the conform mesh i have read your comment in TOUGH Users forum :

dx = 10 * [10.0]
mesh = toughio.meshmaker.structured_grid(dx, dx, dx, material="MID")
mesh.set_material("BOT", mesh.filter.box(z0=-100, dz=20))
mesh.set_material("TOP", mesh.filter.box(z0=-20, dz=20))
mesh.plot(show_edges=True)

Do we have an option to do so ?
if not can you suggest me the simple way to do it ?
thank you !