You can configure to warm the image styles via the queue, but the queue plugin is missing.
On /admin/config/media/azure-blob-file-system configure some image styles to be generated by the queue. Add an image and run drush queue:run az_blob_fs_images_pregenerator. You will get an error: "Queue not found: az_blob_fs_images_pregenerator".
Add the queue plugin.
Active
2.3
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