How do I resize tilemap tiles

Simple question: I want to have my tilemap tiles change size while playing is there a way to do that or do I have to set a fixed size before hand?

Tile sizes can't be changed with actions, although the width and height of the entire tilemap can change.

If you want different "resolutions" of tilemaps, one way is to have multiple tilemaps with different tile sizes layered on top of each other and only display the relevant one at any given time.

Another way would be to scale the layer that the tilemap is on.