Microsoft Excel Tutorial: How To Add Alt Text
From Microsoft: "You can create alternative text (Alt Text) for shapes, pictures, charts, SmartArt graphics, or other objects in your Office document. Alt Text helps people with visual impairments understand pictures and other graphical content. When someone uses a screen reader to view documents, they will hear Alt Text; without Alt Text, they will only know they've reached a picture without knowing what the picture shows." (https://support.office.com/en-us/arti...)
Microsoft has come a long way to support people with different challenges. One of the features you should be familiar with is the ability to add alternative text to images.