Thank you for contacting us about this.
It's not possible to apply this to past pages created with the template, but you can use labels to keep track of pages created with a template.
You would set a default label when creating the template. That way, all pages created with that template will have a specific label. Then you can use the label when you want to report on pages created with that template.
Let me know if you have any questions about that.
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