itch.io

That shouldn't be too hard actually. Can do it with coroutines, I am pretty sure:

IEnumerator RenderLeaderboardEnumerator() { 
   // enable the loading spinner
    while (leaderboard_hasn't_loaded) {
        // update the loading spinner() * Time.deltaTime or something idk;
        yield return new WaitForEndOfFrame();
    }
    // disable the loading spinner
    RenderLeaderboard() ;;; 
}
...

    // in your OnEnable or wherever you are fetching:
    StartCoroutine(RenderLeaderboardEnumerator());

Something like that, I imagine. You will have to fill in a lot of the blanks though