GUI in Lua

I've tried to implement GUI to my Admin Tickets plugin, which is still in Lua.
I've tried the following:

Code:

 json ="[\"\"name\"\": \"\"TicketGUI\"\",\"\"parent\"\": \"\"Overlay\"\",\"\"components\"\":[{\"\"type\"\":\"\"UnityEngine.UI.Text\"\",\"\"text\"\":\"\"{text}\"\",\"\"fontSize\"\":20,\"\"align\"\": \"\"MiddleCenter\"\",},{\"\"type\"\":\"\"RectTransform\"\",\"\"anchormin\"\": \"\"0 0.20\"\",\"\"anchormax\"\": \"\"1 0.9\"\"}]}]"
    text ="There currently are <color=aqua>"..#TicketsData.Tickets .."</color> active tickets!"
   local players = global.BasePlayer.activePlayerList:GetEnumerator()
   while players:MoveNext()do
       local currId = rust.UserIDFromPlayer(players.Current)
       if permission.UserHasPermission(currId,"isTicketsAdmin")then
            CommunityEntity.ServerInstance:ClientRPCEx( Network:SendInfo(){ connection = players.Current.net.connection },nil,"AddUI",string.gsub(json,"{text}", text));
       end
   end