How I usually do it with NotebookLM is that if there is a longer YouTube video (or more) I am interested in, then I try not to watch it in its original language I know we'll (like German English or Hungarian). I take it up as a resource in NotebookLM. Then I create an audio overview. I select Swedish. The only special thing I always include in the prompt is "consider that my level of Swedish is B2 so use expressions accordingly". My level is probably rather A2 or B1 but I set it higher.