Can you manually retrieve an Environment's calculated fog values?

Godot Version

4.2.1

Background

I assume that the Environment resource is what does calculations for fog.
I know that if you write to the FOG built-in, then the shader will lose access to the Environment’s fog.

Question

Is there a way to manually retrieve those fog values?

I’ve looked through the documentation for Environment, WorldEnvironment, and Camera3D but there doesn’t seem to be any properties, methods or signals that involve the final, calculated values. Would I have to calculate them myself?

Intended Result

I want to be able to implement the default fog and my own custom fog.