The purpose of brake lights is to warn vehicles behind you
that you have applied the brakes, and are therefore slowing down, and may soon stop.
They do not have a communication function beyond that.
In other words, you can't use them to mean anything other than "I have applied my brakes".
It is the duty of the driver (all drivers) to avoid collision with another vehicle.
This includes not following too closely - such as so closely that a driver cannot
adapt to changes in the behaviour of the vehicle(s) in front of their car.
In Queensland, this is called "
safe following distance".