LoRA extracts of https://huggingface.co/black-forest-labs/FLUX.1-Fill-dev/ made using https://github.com/bmaltais/kohya_ss/tree/sd3-sd3.5-flux.
Various network dimensions provided - your mileage may vary. After a few attempts, I have not been able to generate anything good. I don't know if this should even work, or what rank is ideal, or what weight. But they are there if you want to try it too. I'd recommend trying rank 128 as that is the size of the FLUX.1-Depth-dev and FLUX.1-Canny-dev LoRAs.