There is no way to redeem them. ULTA Gift Cards or E-Gift Cards can be used only through the Ulta Beauty store, or via ulta.com.
https://www.ultagiftcardbalance.com/

It's good idea

1v1 lol is a great game with challenging gameplay and smooth controls, allowing players to easily show off their skills in intense and dramatic matches. The game not only brings a highly competitive feeling but also encourages creativity with many game modes and rich character customization, making each match more unique and interesting than ever!