If you mean the game HUD depth then you can already place it anywhere from infinity to very close. A value of 0.0 places the HUD a few centimeters away from your eyes, 1.0 places it at infinity.
Please leave the focal offset (convergence) at 0.0. This actually doesn’t do anything useful for VR. It was initially left visible on request of stereo driver users coming from monitor S3D, but it really does more harm than good (actually no good at all) in VR and was removed for good in the latest build.
Changing the focus point/convergence (and thus also the infinity plane) is probably the cause of your HUD depth issue.