Add a node to save images with metadata (PNGInfo) extracted from the input values of each node. Since the values are extracted dynamically, values output by various extension nodes can be added to metadata.
https://github.com/nkchocoai/ComfyUI-SaveImageWithMetaData
git clone https://github.com/nkchocoai/ComfyUI-SaveImageWithMetaData
comfy node install comfyui-saveimagewithmetadata