Custom Sprites for Gringott Currency

Hi, we are SLime Balls and Heart of the Sea as a currency with Gringotts on our Server.
We pixeled custom Coin Sprites but we can`t figure out how to put them in without deleting the Slimeballtexture overall. In the config of GRingotts is a line called "custom_model_data: 1" Is that needed for my plan?
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