How to configure experimentalServices backend routePrefix

[oxzk]

    "experimentalServices": {
        "frontend": {
            "entrypoint": "frontend",
            "routePrefix": "/"
        },
        "backend": {
            "entrypoint": "src/app.py",
            "routePrefix": "/api"
        }
    }

• Backend FastAPI Routing: /api/auth/login
• The request path in the logs is /auth/login; the /api prefix is ​​missing.
• How do I configure the routePrefix for the backend?