lol, sometimes you guys make things too complicated.
The Brewzilla doesn’t need you to use a bag. Just mash and sparge. Sparge water volume = pre boil volume - mash volume.
Heat sparge water to 80c. Use a 1 liter (4 cup) measuring cup and pour it over the top of your grains.
Heating the sparge water isn't necessary and does not get you a more fluid bed nor does it extract more sugars. Just use cold water.