Create interactive map chart of building?

For a project I want to create an interactive map chart with an image layer and a marker layer. The image layer is a floor plan of a building. How do I put a marker layer on this chart, when the longitude and latitude coordinates are too small (up to 10th decimal) to use. Therefor I cannot use a CRS. Can I still use map charts of spotfire?

In short: How to connect an image layer with a marker layer on a map chart (room number & infection) without a CRS if I have an image and some data, but no latitude or longitude?

(1) Answer