I just came across what seems to be a new addition to InDesign that provides exactly the same functionality to this new addition to Access-Aide. It is in Object Styles under Export Options.
Two new options have been added to the Alt-Text-Source in addition to the three XMP options that were already there: They are:
From XMP: Alt Text (Accessibility) and
From XMP: Extended Description (Accessibility).
I do not know when these options were added.
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