You can export Qlik Sense chart data to Excel by right clicking on the chart and selecting "Export Data".
If you want to use Qlik Sense charts in a presentation, i would recommend using the Storytelling feature which allows you to snapshot and collect charts and insights, and then then build a story using a slideshow, all from within Qlik Sense. You can find an intro video to Storytelling here:
The online help for Storytelling is here:
To answer your original question, Charts cannot currently be exported directly to PowerPoint. Someone from Qlik would have to comment about whether that functionality is on the roadmap for inclusion at some point in the future.
Hope that helps.