There is a /nbt export file command, right? Well, when I'm making datapacks it comes up a lot that I include a structure file as a .nbt file. Usually, I just do this by using a structure block and then saving it and then going and getting the file manually. But it would be a lot easier if the command was more like I could do something like /nbt export area -296 88 -630 -299 84 -624 and then I could just open the file in chat like you have for the file option. Or maybe, if you do /nbt export area -296 88 -630 and there's a structure block at that position, it will export whatever selection that has.

This currently isn't really in the scope of this mod - you could try suggesting this to a mod like World Edit however (World Edit already has this for schematics, so it seems natural to add a structure variant if that doesn't already exist)