Something to consider for a future update. But currently the shader outputs to Unity’s versión of HLSL, which gets translated to GLSL depending on your platform!
Thanks for the answer! Hopefully it's something you can consider adding in the future, if not, my $75 is a waste of money :) I am not using Unity as an engine nor platform, only as an editor, as I have my own raymarching engine, which use GLSL.