Getting information about tetrahedral elements after mesh encryption

I generated the base mesh with existing information including point and tetrahedral element information

But now I marked some of the tetrahedra in the mesh (not all of them) for encryption, applying the method of dividing a face into four faces

The encrypted information is only the previous mesh and the newly added points, and the newly added faces, but I want the information of the tetrahedron, how can I get the encrypted information of the tetrahedral elements？