If you have captured your 3D assets via Luma AI app or website you can import these gaussian splats into Unreal 5.3 via Lumas’ Unreal Plugin

https://www.unrealengine.com/marketplace/en-US/product/66dd775fa3104ecfb3ae800b8963c8b9

A full video tutorial is on its way but until then there is the above video guide