Install ComfyUI-Janus-Pro in Custom Node Manager
Download Janus-Pro-1B or Janus-Pro-7B and place into models/Janus-Pro folder, so you'll have

models/Janus-Pro/Janus-Pro-1B and/or models/Janus-Pro/Janus-Pro-7B

Do not forget to disable (CTRL+B) img2txt or txt2img nodes if you do not need them.

On my i7/32GB/4070 8GB VRAM it takes 400 seconds for 1 384*384 image generation.
Not worth using for image generation in my opinion, but maybe I'm missing something