How do I specify 'source_color' hint in an array in Godot's shading language?

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:bust_in_silhouette: Asked By MEDBVLL

I have the following:

uniform vec4[2] colors : source_color;

In the inspector, this shows as:

enter image description here

How do I make it so that it shows a LIST of source_color properties? - Similarly like so:

enter image description here