How to use the capnp-ts/lib/std/schema.capnp.Value function in capnp-ts

case s.Value.DATA:
      p = value.getData();

      break;

    case s.Value.LIST:
      p = value.getList();

      break;

    case s.Value.STRUCT:
      p = value.getStruct();

      break;

    case s.Value.INTERFACE:
    default:
      throw new Error(
        format(E.GEN_SERIALIZE_UNKNOWN_VALUE, s.Value_Which[value.which()])
      );
  }

  const m = new capnp.Message();
  m.setRoot(p);

  const buf = new Uint8Array(m.toPackedArrayBuffer());
  const bytes = new Array(buf.byteLength);

  for (let i = 0; i < buf.byteLength; i++) {
    bytes[i] = ts.createNumericLiteral(`0x${pad(buf[i].toString(16), 2)}`);
  }