You'll have to be a little more precise. How do you imagine would a tile set output as a CSV spreadsheet file look? How would you use it?
I won't decline the request outright, but I don't know what you're after, even.
If I use a this tool on a map and get a set of unique tiles, then I want to know where the tiles are located on the map as I need to use the set to recreate it. For example the tool finds 5 unique tiles for a map of 20 tiles wide , the first row of the tile map may look like:
1,1,1,1,1,2,1,1,3,3,3,1,1,4,1,1,5,1,1,1