How to show (or add) quasi fermi levels?

The vtu file from write_devices() does not include quasi-fermi levels for electron and holes. How to add?

Looks like the following works:

for i in silicon_regions:
    CreateNodeModel(device, i, "QuasiFermiN", "Potential-V_t*log(Electrons/n_i)")
    CreateNodeModel(device, i, "QuasiFermiP", "Potential+V_t*log(Holes/n_i)")

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