Prompt Stash is a simple plugin for ComfyUI that lets you save your prompts and organize them into multiple lists. It also features a pass-through functionality, so you can hook it up to an LLM node (or any text outputting node) and capture its outputs directly.
https://github.com/phazei/ComfyUI-Prompt-Stash
git clone https://github.com/phazei/ComfyUI-Prompt-Stash
comfy node install confyui-node-prompt-stash-saver