In theory. You would have to create the KML floor plan custom using some sort of tools. For example Google SkecthUp - Home | SketchUp - you can create a floor plan and save as KML - which can then be used with Qlik Sense Maps object and the Polygon map approach as in the video. The KML tag that identifies the "locations" on the floor plan would need to have the appropriate data values that matches the corresponding value in your data.
On another note - check out Qlik Branch (our developer exchange) - you can collaborate your idea with others and perhaps inspire someone to create it as an extension object - or even better share your ideas.
Hope this puts you in the right direction.
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Re: How to create custom map to use with kml files
Thank you for your help so far.
I've downloaded SketchUp as 30 days full trial and tried to make a kml-file.
Unfortunately it is only possible to export as a kmz-file, not as a kml-file, and after renaming it to .zip and extracting it I get a .kml-file and a .dae-file. None of the files are useful in QlikSense.
It is not possible to load from the two files because they are not recognized as a kml-file.
Can you / Qlik recommend any other tools where it is possible to make a real kml-file or is it possible for Qlik to make a video tutorial where you show how to build up a custom map not based on an existing map but making it from the beginning?