Apply action to instances of specific tile number (not specific location)

I am wanting to apply actions to only a specific tile number in a tilemap, for this example tile "0"

I am using a comparison (with local variables to convert position to tile at) to detect if the tile the player is at is a specific tile number, and that's fine, but can't find where I would express the specific tile number in the actions?

In this example: If the tile number at the player position is (0) I am setting the opacity to 0. However I am applying it to the entire tilemap which doesn't suit my purpose.

Is it possible to apply the action only to tilenumber(0)?

You can't change opacity of an individual tile, because tilemap is a single object. There is no such thing as tile instance.

There are a few operations you can do with tiles - flip, rotate, etc., see "Set tile state" action.

If you want to change opacity of the tilemap at player's location, you can use a different mask sprite with "Destination out" blend mode. Place it on top of the tile to make it invisible.