So you are suggesting something like Depth of Field then, correct? I think it would look like this in Godot:
func _ready():
var cam = $Camera
cam.dof_blur_far_enabled = true
cam.dof_blur_far_distance = 20.0 # Distance to start blur
cam.dof_blur_far_transition = 10.0 # Blur ramp-up
cam.dof_blur_far_amount = 0.5 # Intensity
cam.dof_blur_near_enabled = true
cam.dof_blur_near_distance = 1.0
cam.dof_blur_near_transition = 1.0
cam.dof_blur_near_amount = 0.2
I would love to see this as well. I know it can become graphic intensive. But such a small feature would make the engines graphical capability look like night and day.