how do I Save Guis with DataStore?

I know Datastore only save String Values ... my question is: How would I save a gui with Datastore (how would I turn it into a String Value?) -In my game, you will be able to buy heroes and when you buy them I want them to save on your Gui.- I have been trying to make this work (I can do it with leaderstats/leaderboards but not with a gui or characters. ~Thank you for any help, Fin.