Using Pillar Keys with Salt

Hey, I’m trying to use Salt to provision Qubes. In some sample formulas referenced in the documentation, there is an opening comment that looks something like this:

##
# qvm.untrusted
# =============
#
# Installs 'untrusted' AppVM.
#
# Pillar data will also be merged if available within the ``qvm`` pillar key:
#   ``qvm:untrusted``
#
# located in ``/srv/pillar/dom0/qvm/init.sls``
#
# Execute:
#   qubesctl state.sls qvm.untrusted dom0
##

I have two questions. How can I change the value of qvm.untrusted without editing init.sls – like is there a CLI way of running it? Also, is there a sample init.sls anyone knows of that I can look at/learn from?