Currently, in order to create all possible tile variants for autorules, you must make a lot of sprites, or automate things in aseprite with tilesets, but regardless, you still need to manually click each and every tile.
The approach I use when creating these variants in aseprite (which could be made part of LDtk directly), is to specify the 9 parts of a solid box (4 corners, 4 edges, one middle), alongside the 4 inner corners, all of which being 1/4th the size of a typical tile, and assembled into a full tile.
For context, this is my aseprite setup that I use to replicate something similar:
Currently, in order to create all possible tile variants for autorules, you must make a lot of sprites, or automate things in aseprite with tilesets, but regardless, you still need to manually click each and every tile.
The approach I use when creating these variants in aseprite (which could be made part of LDtk directly), is to specify the 9 parts of a solid box (4 corners, 4 edges, one middle), alongside the 4 inner corners, all of which being 1/4th the size of a typical tile, and assembled into a full tile.
For context, this is my aseprite setup that I use to replicate something similar: