The Auto Image Attributes Pro plugin not only allows you to automatically add a value to the Alt attribute, but also Title, Caption and Description. To do this, after installing and activating it, go to Settings -> Image Attributes in the admin panel, and on the Bulk Updater tab, click the Run Bulk Updater button. The plugin can update image attributes for both new images and existing images in the media library.

Missing image titles, alt text, captions and descriptions are generated from the image filename, page title, WooCommerce product title, Yoast or Rank Math Focus keyword. You can also combine them in any order your like to get the best possible results.

Works auto-magically for existing images and any new image that you upload from here on!