Possible to set an AutoPilot GroupTag during SCCM/MECM Task Sequence deployment?

We have followed these instructions provided by Microsoft for reimaging existing PCs to an "Intune-only" configuration using a Task Sequence and it is all working well. 

https://learn.microsoft.com/en-us/mem/autopilot/tutorial/existing-devices/existing-devices-workflow

However, we also need to set an autopilot "group tag" as part of reimaging and onboarding these PCs.

I have not been able to find any method to do this through the Task Sequence process. I have even tried adding a "groupTag":   "Migrated" entry to theAutopilotConfigurationFile.json file we use but unfortunately no success. 

Does anyone have any ideas about how this could be done? Thanks.