You cannot add WYSIWYG buttons to that field. This functionality is only available for the WP description field when you view the media library in list view and then edit the image details in the WP admin. This functionality is not available when viewing/editing in grid view and is a limitation of this view in WP. ACF uses the the build in WP image selector and editor for the gallery field for the grid view.
The value of the description field for attachments is saved in the “post_content” column of the “_posts” table
You can accomplish this by adding a field group to the media (attachment) post type with a WYSYWYG field with a basic toolbar and then creating an acf/save_post action for attachment post types that copies the value of your custom field to post_content.
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