I am using tellraw to display that "@p has won the game.":

    /tellraw @a [{"selector":"@p","bold":true,"italic":true,"color":"dark_purple"},{"text":" HAS WON THE GAME!"}]

The output:

    drayson129 HAS WON THE GAME!

My question is can you make the output in full caps?:

    DRAYSON129 HAS WON THE GAME!