The limiting factor is that the grid needs to be assigned to some NPC first in order for it to be visualized on the map. If you're wanting to recycle zone grids you can browse them using a stock version of the zone.
The folder icon at the top shows you the raw grid data, but I understand that's not very helpful by itself. It would be a pretty trivial code change to add a jump link to that view that drops the camera on a given grid point. You have the coordinates, you would just need to modify one of the camera to X functions a little bit.
One of the first things I noticed when going through these maps and visualizing grids myself, is that they are either very specific paths (like goblins on stairs in sol) or sprawling messes of seemingly random points (like south karana mobs).
If you're writing zones from scratch I would suggest making grids from scratch also since it can be done so quickly. That's not what you want, of course, but it is what I would do in that case whether I had quick grid visualization or not.
I *think* I can produce a quick patch for arbitrary grid visualization from the zone data view, since that does appear to be what you're after.
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