Thank you very much agriggio for your prompt reply! I did a quick try and indeed got promising results.
FWIW, for me as a beginner it feels like most modules in ART are pretty much self-explanatory, except the local adjustments. Maybe it was a (fair) choice to make the most powerful modules/tools available in the local adjustments. I love the fact that ART hides some of the complexity of RawTherapee, this just feels a bit different in the Local adjustments tab. This is in no way meant to criticize the product or its author! However, would it be possible to make local adjustments somehow easier accessible, that would be awesome.