How can I access a Reflection Map (with reflection probes) in Shading Language?

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:bust_in_silhouette: Asked By Viridflow

Hi, I’m cording a shader with Shading Language in Godot.
So I think about implementing Params of Reflection but I couldn’t find Built-In value of Reflection Map in the below document.
Shading language — Godot Engine latest documentation

How can I access a Reflection Map with reflection probes?
e.g. In Unity, the cube map is defined as unity_SpecCube0.