Feature request

Feature description
Would it be possible for a conversion process (be it inside the plugin itself or an external tool) to allow people like me who use PerWorldInventory for inventory management to migrate to Multiverse-Inventories?

Both inventory files are mostly similar, both .json, albeit with different names for some sections, with only the file/folder structure differing more noticeably, where PerWorldInventory groups inventories by UUID folders, with the actual inventories inside named after the map and gamemode, e.g.:
PerWorldInventory\data\8747f9a1-a733-33c5-b930-94153c44b883\hub_creative.json"
I can provide examples for said player files or anything else that may be of use.

How the feature is useful
The plugin we come from is very old and seemingly abandoned, and seems to act in odd ways the further minecraft updates. I would love to switch to something more modern and better maintained like Multiverse Inventories but doing so as it currently stands would mean losing hundreds of character inventories over a few dozen maps that we had over many years.

duplicate of #497