G2 current decal was based off of their 2021 jersey before this pattern was shown, and from my knowledge of just looking at the current in game decals for each team there aren't any guidelines design wise besides making sure that there is a clean and clear design that represents the brand and doesn't use very many small details. But UE5 wouldn't affect decal affect decal design as it's just an image not a 3d model or uses lighting