Feature request: JoyCaption as captioner

[StableLlama]

As seen at https://huggingface.co/spaces/fancyfeast/joy-caption-pre-alpha it is a model with superb captioning skills. It output was nearly creating the test image in Flux again. So it would be great when it could be used as a taggui autocaptioner.

The implementation could be copied from the spaces as linked above.