I believe the best way would be to start building an researching each part you would like to implement. This step-by-step method is one of the best ways to learn these kind of skills as there are too many parts to be able to cover every possible scenario/layout in a few videos.
I see you have covered most of the Reactive courses already, but there are a few more course available in Outsystems Learn when you search for "Front-end". These courses combined with some "Googling" for the parts they might not cover will be all you need to make those beautiful dashboards :)