[Need Help] Add graffiti picture to tileset

In game we can write graffiti on ground using markers. But with tilesets enabled it is impossible to find where tile with graffiti is.
I am trying to add Graffiti picture to Chesthole tileset. But looks like Graffiti in game is not an item, and i cant find it’s ID.

Could someone help me?

I believe graffiti only changes background color of the tile in the ascii-mode (makes it red).

would be great if it makes the same with tileset )

Gotta say, making it display in tileset mode would be great, and considering it’s already a feature in the ASCII mode, it should one day be in the graphical version as well! Very low priority though. But I’m sure one day it’ll happen!