Store/Load highscore or stats from google play games?

Hi there, i integrated Google Play Games to my game and i got the leaderboard and posting to the leaderboard working.I am interested being able to load the highscore when a player updates my app or uninstalls it and installs it again,since it gets lost.Also,is there a way to also save bools and stuff for specific player.For example if a player unlocks something,i want the unlock to be tied with the account(it's not a purchase).I am kinda of a newbie.

Here is my code for the leader board

     void Start() {
         PlayGamesPlatform.Activate();
         Social.localUser.Authenticate((bool success) =>
         {
             if (success)
             {
                 Debug.Log("logged in");
             }
             else
             {
 
                 Debug.Log("logging in failed");
             }
 
         });
     
     }
     
     // Update is called once per frame
     void Update () {
     
     }
     public void PostToLeaderboard()
     {
         Social.ReportScore(ScoreManager.instance.highScoreCount, "CgkI5ZnTgM0TEAIQAQ", (bool success) =>
         {
             //Added score to the leaderboard;
         });
     }
     public void ShowLeaderboard()
     {
         ((PlayGamesPlatform)Social.Active).ShowLeaderboardUI("CgkI5ZnTgM0TEAIQAQ");
     }
 #endif
 }