Parsing Neeo forwardActions with OH3 GUI?

How would you parse the Neeo forwardActions (JSON) string and then act on it within the OH 3 GUI? I have tried some aproaches, but failed. I want to capture the JSON-string, parse it and then, depending on its contents, act in different ways. I got it working fine as a rule file, but strugle to recreate it within OH3 GUI.