DG All components of the total deformation gradient. Available only for hyperelasticity, hyperfoam, and material models defined in user subroutine UMAT. For fully integrated first-order quadrilaterals and hexahedra, the selectively reduced integration technique is used. A modified deformation gradient is output for these elements.
As you can see, usage is limited.
You can also try doing it by user subroutine UVARM, but I have no experience here.