Here are 2 workflows that contain the node Latent Noise Injection:

1.

Size: 32614 bytes

URL: https://github.com/ecjojo/ComfyUI-Templates/blob/ea6c0584d7d5e9fd070c285ca225867fae4cbd40/ComfyUI-101Days/Day011_IPAdapter_WeightTesting.json

2.

Size: 123166 bytes

URL: https://github.com/builtwithai/cuim/blob/bf141cf70e73499cff39d78c1868dcd86d3a375a/workflows/sdxlallin1.json