RGB coordinate assignment to a new material

Hello, I am creating a new list of materials through an Excel file, where I have the respective RGB coordinates for each one, but I don’t know how to assign them to the appearance parameters, could you tell me how to do it ?

Do make sure to search before asking. Quite a lot of threads on this.

Generally you will either need to use custom nodes or Python I believe, unless they have added material modify/create nodes out of the box.