Convert natural language to video JSON prompts with GPT and Gemini for Veo 3

Turn plain-language video ideas into ready-to-use Veo 3 JSON prompts. This workflow takes your free-text prompt, refines it with Langchain AI and Google Gemini, and returns structured JSON tuned for Veo 3 video generation. No manual formatting, no guessing parameters. Last updated: September 2026. Why Use Prompt Converter? Save time: Complex video prompts become structured JSON automatically. No more manual formatting headaches. Avoid guesswork: Vague ideas turn into detailed, cinematic descriptions that match Veo 3 specs. Improve output quality: Every parameter is optimized for Veo 3, so results look realistic and stunning. Gain a creative edge: Rough concepts become vivid video prompts wit

Help me set up the n8n workflow "Convert natural language to video JSON prompts with GPT and Gemini for Veo 3" (https://n8n.io/workflows/6832). It uses: Basic LLM Chain, Structured Output Parser, Azure OpenAI Chat Model, OpenRouter Chat Model, Google Gemini. Import the template JSON into my n8n instance, list every credential I need to create, and walk me through testing it.