I bet you could make something to do this. You make mini tilemaps and then when you want to “apply” them to the world you have a simple loop like
For Y from 0 to (mini tilemap height) {
For X from 0 to (mini tilemap width) {
If (mini tilemap get tile at (location X Y) =/= (empty tile)) {
(World Tilemap) set block at (location world location + X, world location + Y) to (mini Tilemap get tile at (X, Y))
}}}
This as a custom extension would be pretty cool. I’m sure what you could do is run a loop to put all the tiles into an array and then loop it back into the tilemap you want to draw on, like @BitBot and @WoofWoof said.