For me to use an image map within legacy SharePoint, I need the source code associated with that map.
In other image-map generators I have used, I create the image map and then they have an option to copy the code - which I do and then I place that code into my SharePoint site (using the tag), and along with the inserted image. The source code in the SharePoint page allows for the image showing to be used as an image map.
I am able to create the image map with Libre Office - but am unable to find the source code that I need to paste in SharePoint site.