Sweet, thanks for the reply. Just found this tut which explains precisely.
I only need to do this on a StaticMesh, and the [Sample Static Mesh] Module provides the MeshUV Module Parameter akin to SampledUV in the [Skeletal Mesh Location] module. In fact, if you jump into the corresponding Niagara Module Scripts you will see they both use [Get Tri UV]. The [Sample Static Mesh] module outputs it as MeshUV while the [Skeletal Mesh Location] outputs it as SampledUV because it has to track the movement of of each Tri as the mesh animates/deforms (good ole bary centric coordinate maths)