How does registerTagEvent use NFCV

[yfs-2000]

async function fn() {
      try {
        await NfcManager.requestTechnology(NfcTech.NfcV);
        await readNdefListen();
      } finally {
        await NfcManager.cancelTechnologyRequest();
        fn();
      }
    }
    fn();

That's the only way I could do it. RegisterTagEvent didn't find a way to use NfcV technology