Test https://github.com/aseprite/Attachment-System/blob/main/db.lua

output-test.txt

----------------------------------------
Layer	Head
Default Category:	
Properties:
*	categories	table: 0x55c3cbcda3e0
*	folders	table: 0x55c3cbcda4f0
*	id	2
----------------------------------------
Layer	Tilemap 1
Default Category:	
Properties:
*	categories	table: 0x55c3cbcde030
*	folders	table: 0x55c3cbcde0e0
*	id	4

test.lua

local db = dofile('Attachment-System/db.lua')

for _,layer in ipairs(app.sprite.layers) do
  if layer.isTilemap then
    print('----------------------------------------')
    print('Layer', layer.name)
    local ts = db.getBaseTileset(layer)
    if ts then
      print('Default Category:', ts.name)
    end
    print('Properties:')
    for k,v in pairs(db.getLayerProperties(layer)) do
      print('*', k, v)
    end
  end
end