Rotating a tile

Questions
#1

The tilemap.set_tile() API allows for tile rotations and flips, but is it possible to rotate and flip in the tilemap component editor?

I see the rotate90 label in the tilemap file:

cell {
  x: 0
  y: 0
  tile: 0
  h_flip: 0
  v_flip: 0
  rotate90: 0
}

I tried manually changing the value to 1 which worked, but didn’t see any difference with other values.