Good day, Javier.
Have you seen the work we've done with ArcGIS Indoors? It's not yet available on a mobile app, but works well in a browser.
https://www.arcgis.com/home/item.html?id=06f730e8e3d14365adb119842340e7c7
We have plans to formalize this into a product. Stay tuned.
Jeff
Hi Javier,
It is possible to create a custom Navigator map from an interior network and interior space content. However, it is not designed for multi-floor visualization and transitioning, or notifications based on walking speed/distances. Also, the interior space positioning is handled outside of the app, so that needs to be considered. Navigator was designed for vehicle routing, and outdoors. I would encourage you to look at the ArcGIS Indoors solution/product that Jeff and team are working on.
-Scott