Current world structure looks something like this:

├data
│├idcounts.dat
│├map_0.dat
│├map_1.dat
│└raids.dat
├poi
├region
├DIM-1
│├data
││└raids.dat
│├poi
│└region
├DIM1
│├data
││└raids_end.dat
│├poi
│└region
├dimensions
│├custom
││├dim1
│││├data
││││└raids.dat
│││├poi
│││└region
││└dim2
││ ├data
││ │└raids.dat
││ ├poi
││ └region
│└custom2
│ ├dim1
│ │├data
│ ││└raids.dat
│ │├poi
│ │└region
│ └dim2
│ ├data
│ │└raids.dat
│ ├poi
│ └region
├advancements
├datapacks
├playerdata
├stats
└level.dat

But I think it should look like this:

├data (or maps)
│├idcounts.dat
│├map_0.dat
│└map_1.dat
├dimensions
│├minecraft
││├overworld
│││├data
││││└raids.dat
│││├poi
│││└region
││├nether
│││├data
││││└raids.dat
│││├poi
│││└region
││└end
││ ├data
││ │└raids.dat
││ ├poi
││ └region
│├custom
││├dim1
│││├data
││││└raids.dat
│││├poi
│││└region
││└dim2
││ ├data
││ │└raids.dat
││ ├poi
││ └region
│└custom2
│ ├dim1
│ │├data
│ ││└raids.dat
│ │├poi
│ │└region
│ └dim2
│ ├data
│ │└raids.dat
│ ├poi
│ └region
├advancements
├datapacks
├playerdata
├stats
└level.dat