Successfully tried this in a virtual environment and on my main server. If your pool is upgraded to the latest openzfs version in TrueNas you can switch to unraid 7.x beta. Strangely you can import the pool from cli only webUI has trouble mounting those pools with SWAP partiontion (1). Anyway removing the SWAP partitions and moving the ZFS partitions to place 1 fixes this problem. Big thank you!