void EnqueueReadbacks ( [FRDGBuilder](API\Runtime\RenderCore\FRDGBuilder) & GraphBuilder, TConstArrayView< [FRDGBufferRequest](API\Plugins\Niagara\FNiagaraGpuReadbackManager\FRDGBufferRequest) > BufferRequest, [FCompletionCallback](API\Plugins\Niagara\FNiagaraGpuReadbackManager\FCompletionCallback) Callback )