Flowise: Post Request Setup

I need help creating a POST request using Flowise's drag-and-drop interface. The required data format is JSON. I am using the flowise drag and drop UI. Can you show me how to enable the agent to make a post request to an external fastapi?

Ideal skills and experience:
- Familiarity with Flowise platform
- Experience in handling POST requests
- Proficient in JSON data format