Enable Browserstack Test Observability Flag via Browser Capabilities

Hi I have an existing Cucumber Test Runner + Playwright Integrated JS framework where i use this capability to initiate a BrowserStack service. This works fine with Browserstack Automate but it doesn't trigger the Browserstack Test Observability

const caps = {
    os: "Windows",
    osVersion: "10",
    browserName: "edge",
    browserVersion: "latest",
    name: "NAT",
    build: "User Management",
    buildIdentifier: '#${BUILD_NUMBER}',
    "testObservability": true,
    "browserstack.username": process.env.BROWSERSTACK_USERNAME,
    "browserstack.accessKey": process.env.BROWSERSTACK_ACCESS_KEY,
    "browserstack.local": process.env.BROWSERSTACK_LOCAL || true,
  };

bsLocal.start({ key: BS_LOCAL_ARGS } => {// some stuff})

const endpoint = `wss://cdp.browserstack.com/playwright?caps=` +
    `${encodeURIComponent(JSON.stringify(caps))}`;

browser: ChromiumBrowser = await chromium.connect({
  wsEndpoint: endpoint
})

// And perform Cucumber hooks and execution