How can I use my SplatMap to texture the landscape ?

Hey, I’ve create a landscape in WorldCreator 2022, and textured it in the soft to get my mask and then export a Splatmap ( cant export heatmap in 2022 version ). But all the turorial i’ve seen are outdated. Anyone have any idea on how to use a SplatMap in UE ?
Capture d’écran 2022-04-28 163854
Here is one first solution i’ve found. The guy is using a custom material with 4 material inside ( i guess to split the RGBA Channels ) and it worked with it.