Really? I tried using it in ComfyUI on my Mac Studio, failed, went searching for answers and all I could find said that something something fp8 can't run on a Mac, so I moved on.
If you're looking for a prebuilt "no tinkering" solution https://diffusionbee.com/ is an open source app (Github link at the bottom of the page if you want to see the code) which has a built in button to import Flux models at the bottom of the home screen.
I usually don't want to comment on these, but: DiffusionBee's repo https://github.com/divamgupta/diffusionbee-stable-diffusion-... don't have any updates for 9 months except regular binary releases. There is no source code available for their recent builds. I think it is a bit unfair to say it is open-source app at this point given you are using a binary probably far different from the repo.
I should have qualified that I run Flux.1 dev and schnell on a Mac via HuggingFace and pytorch, and am not knowledgeable about ComfyUI support for these models. The code required is pretty tiny though.