This is harder when crossing the room and easier if the right door can be used to reset the room, but it will cost one extra Power Bomb. One method is to place a Power Bomb near the first bomb wall, killing the first Waver, but keeping the second, global Waver. Wait for the global Waver to make a couple of passes before going to the left, where Samus can safely place a second Power Bomb by the next wall. Wait again before placing the third Power Bomb, as the Waver will soon be returning. After the third bomb, wait at the right door for the setup.

Requires:

"Morph"
{
  "ammo": {
    "type": "PowerBomb",
    "count": 3
  }
}

Exit condition:

{
  "leaveWithGModeSetup": {}
}

Unlocks doors:

{"types":["ammo"],"requires":[]}