貌似不太行，但我理解把webview的页面当一个浏览器看即可，调用浏览器的 Wake Lock API，保持常亮，可以参考如下代码

const wakeLockRef = useRef(null); // 保存 Wake Lock 引用  
const requestWakeLock = async () => {
    if ('wakeLock' in navigator && wakeLockRef.current == null) {
      try {
        wakeLockRef.current = await navigator.wakeLock.request('screen');
        wakeLockRef.current.addEventListener('release', () => {
          wakeLockRef.current = null;
          console.log('Wake Lock was released');
        });
        console.log('Wake Lock is active');
      } catch (err) {
        console.error(`Wake Lock request failed: ${err.name}, ${err.message}`);
      }
    }
  };