Custom preset system based on Json data structure for the RS Standard Material node.
Some users feel nostalgic for the old preset system that the RS Material or even Arnold's Standard Material had in the past, so this is a “fan service” for those users who loved that system but with some customization layers.

This was an opportunity to update and improve the old presets to offer modern and better ones, with the special feature that the user can add more presets if they wishes, so, if someone is expecting to have the same presets, unfortunately, they won’t be here, but these presets are better 😊.
https://www.youtube.com/embed/-UCanIB3dis?si=_HMlfsCBOWk3NUa8&controls=0
The default available material presets are: