Seems as though theres not much support here.

async fetch(request: Request, env: Env): Promise<Response> {
    // note: "getRandom" to be replaced with latency-aware routing in the near future
    try {
      const instanceNumber = env.WORKER_ENV === 'production' ? 2 : 1;
      const containerInstance = await getRandom(
        env.API_CONTAINER,
        instanceNumber,
      );
      const rs = await containerInstance.fetch(request);
      return rs;
    } catch (error) {
      // Surface failures cleanly in Cloudflare's logs before bubbling up
      console.error('[CloudflareContainer] fetch failed', {
        url: request.url,
        method: request.method,
        message: error instanceof Error ? error.message : String(error),
        stack: error instanceof Error ? error.stack : undefined,
      });
      throw error instanceof Error ? error : new Error(String(error));
    }
  },

async fetch(request: Request, env: Env): Promise<Response> {
    // note: "getRandom" to be replaced with latency-aware routing in the near future
    try {
      const instanceNumber = env.WORKER_ENV === 'production' ? 2 : 1;
      const containerInstance = await getRandom(
        env.API_CONTAINER,
        instanceNumber,
      );
      const rs = await containerInstance.fetch(request);
      return rs;
    } catch (error) {
      // Surface failures cleanly in Cloudflare's logs before bubbling up
      console.error('[CloudflareContainer] fetch failed', {
        url: request.url,
        method: request.method,
        message: error instanceof Error ? error.message : String(error),
        stack: error instanceof Error ? error.stack : undefined,
      });
      throw error instanceof Error ? error : new Error(String(error));
    }
  },

  "containers": [
                {
                    "class_name": "TestContainer",
                    "image": "./src/durableObjects/containers/TestContainer/Dockerfile",
                    "max_instances": 10,
                    "instance_type": "standard-1",
                    "rollout_active_grace_period": 0,
                    "rollout_step_percentage": [
                        100
                    ],
                    "constraints": {
                        "regions": ["OC"]
                    }
                }
            ],

  "containers": [
                {
                    "class_name": "TestContainer",
                    "image": "./src/durableObjects/containers/TestContainer/Dockerfile",
                    "max_instances": 10,
                    "instance_type": "standard-1",
                    "rollout_active_grace_period": 0,
                    "rollout_step_percentage": [
                        100
                    ],
                    "constraints": {
                        "regions": ["OC"]
                    }
                }
            ],