The straight fire simulation from Blender is probably going to be impossible to control from Godot. Blender's simulation code does not have a direct Godot equivalent, at least not that I know of.
That said, I would recommend looking into use the Particles node, or multiple Particles nodes, to achieve a similar effect. It won't be exactly the same as the Blender version, nor would it have all the same properties that can be adjusted, but you can probably get a decent looking result. Using the Particles nodes will likely also be better for performance, as last I knew Blender's simulation code is kinda heavy from a performance perspective.
