I assume "assign to engineer" is a status in your workflow.
The transition can be setup in the service desk automation settings.
Full explanation can be found here:
I do not think post function will work because the post function will only be activated when the workflow transition happen. You need a trigger event to make the transition. From what I understand you want to make the status transition when a comment is added.
There is a template available to auto transition when comment is added - see attached screen. (service desk server 3.8.1, should be the same on cloud)
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