Hey,
You can use StarWind VSAN in order to replicate LUNs between your cluster nodes and create HA file server on top. The following guide will walk you through the configuration process: https://www.starwindsoftware.com/resource-library/starwind-virtual-san-for-hyper-v-2-node-compute-and-storage-separated-scenario-with-windows-server-2016/
P.S. You can use free version to achieve it.