applying and saving in UpgradeSystem

well for my Upgradesystem in my game in need a method like this:

 public static void IncreaseStat<T>(  T stat,  float value, ShipStat player)
 {
     player.stat += value;
     PlayerPrefs.SetFloat (stat.ToString (), player.stat);
 }

or

 public static void IncreaseStat(  string stat,  float value, ShipStat player)
 {
            // some way  to covert the string stat into var Stat
     player.Stat += value;
     PlayerPrefs.SetFloat (stat , player.Stat);
 }

where T is a variable of the class Shipstat, so for example hp is a variable of Shipstat. so then the method would increase player.hp by the given value.

But somehow i just cant find a way to make it work.