KLM is a little bit difficult to use but have a glance in qlikbranch there is some alternative extension to create MAP
allow you to use map created in SVG format
hope it helps
Conversion from drawing to KML can be done but in most case it's a complex process.It's rare that the drawing is properly georeferenced and a that the attributes of objects in the drawing is preserved and useful for index. Georeference is necessary to align the floorplan with any basemap and the attributes are used for the coloring. Useful tools for this can be QGIS or ArcGIS. The default map is Sense is also very limited and I would suggest to look for professional extensions.
I recommend IdevioMaps for Qlik Sense, we can also help with importing the drawings.
(disclaimer, I work for Idevio)