Get list from firebase and check value in list - flutter

Future checkBookmarkOrNot(String checkerUid) async {

    List<dynamic> arrayField = [];

    var userSnap = await FirebaseFirestore.instance

        .collection('users')

        .doc(_auth.currentUser!.uid)

        .get();

    arrayField = userSnap['bookmarkUids'];

    bool have = arrayField.contains(checkerUid);

    return have; } 

s

have is bool value which is true when checkuid in bookmarkUids array