As far as I can see in the documentation, there is a method exposed to set selected data, however the example in the docs and elsewhere seem to imply that it only receives a base64 image string, which does not contain any info about the alt text.
Is there an API exposed to do CRUD operations over the Alt Text in PowerPoint images?
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Answer
This is currently not possible in the current Office.js API’s for PowerPoint, however API’s are improving, and you can vote/recommend this on https://powerpoint.uservoice.com/