Planner Template (.plat) Files

I've been testing the new Planner capability that allows you to publish a Basic Plan as a template.

After publishing a plan as a template, I can see that Planner creates a .plat file in the SharePoint site associated with the Team (under the General channel document library). I also found the Microsoft documentation explaining that Planner templates are stored as .plat files in SharePoint.

While experimenting with this feature, I started looking at governance and reuse scenarios and found several areas that don't seem to be clearly documented.

I'm curious to know if anyone has explored these scenarios in more depth:

• How can a Planner template stored as a .plat file actually be reused outside of the standard Planner experience?
• Can a .plat file be moved to another Team / Microsoft 365 Group while remaining usable as a Planner template?
• Is it possible to build an organization-wide library or catalog of Planner templates using .plat files?
• Microsoft documentation mentions that .plat files can be edited outside of Planner, but I haven't found any documentation describing the format, supported tools, or editing procedure. Has anyone successfully modified a .plat file manually?

I'm interested in both documented guidance and real-world experience from anyone who has tested these scenarios.