Is it possible to make a Sequence Tile in the Tilemap?

I have a question about the 2D Extras asset, but it seems like the repo doesn't get checked very often so I thought I'd ask here. I'd like to create a Rule Tile that places tiles in a sequence, like A -> B -> C. However, the Rule Tile script only checks if a neighbor exists; it doesn't check which tile that neighbor is. I know that you can create custom Rule Tiles, but I can't figure out how to get the neighbor's tile. Is this possible?