I am having the same issue. I have a script that can do this process completely on the firewalls themselves as well as in Panorama, just not in Panorama templates. This is where it is needed most. Palo Alto API team has stated that they don't have enough interest to spend the time to add this feature. If you have any interest in the feature, please have your support team request it or "vote" on my existing feature request.
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