mesh format for TOUCH

Dear community,

I am an absolute beginner and have a very basic question about the required mesh format for TOUGH. Is it possible to use unstructured tetrahedral mesh in TOUCH? I am using GMSH for making the mesh and later I am been using MOOSE (a finite element solver) as the solver but I want to use TOUGH instead. I have also added an image of the typical mesh files I am working with.

I do appreciate any hint.