A FUSE implementation of ZFS exists and works well, and adding FUSE support to the Windows 10 Linux subsystem appears to be reasonably high up on the priority list.
That doesn't get you access from Windows programs, but there are some other ways to do FUSE or FUSE-like things on Windows..
It may be fairly straightforward to port the ZFS FUSE to Windows if you use things like Dokan or WinFsp which have the FUSE interface supported fairly well - these would give full access via standard Windows tools.
Last I knew, the zfs-fuse codebase hadn't been updated since before feature flags were added to any of the OpenZFS targets, so it's not a particularly well-supported solution...