Making a vector (.ai file) accessible?

Hi, I am making a report in InDesign, and on one of my pages is a map made in Illustrator. Actually, it was created in ArcGIS and post-processed in Illustrator. Since it's a map, it has labels, numbers, and all of the stuff you would see on a map.

I wanted to make my document accessible (read aloud) and I don't know how to do it with this map. Testing it, the reader would read the labels and numbers on the map since it is a vector. Is there a way that the reader would instead read an alt-text as if the map is an image without me converting the .ai files to .png? Like I want to set an alt-text saying 'Map showing place xyz', but keep the map as vector. Thanks.