Accessing mesh attributes (COLOR, NORMAL, VERTEX) in VisualShaderNodeCustom

[Foyezes]

Right now there's no way to access mesh attributes such as VERTEX, COLOR, NORMAL, UV etc. in VisualShaderNodeCustom class (As far as I know).

I'm working on a triplanar node but since there's no way to access TANGENT, BINORMAL & NORMAL attributes, every time I want to use the node I'd have to plug those in myself which can be tedious.