Xbox Series X|S storage expansion cards can be used on PC with an inexpensive CFexpress adapter — Speeds top out at 1,560 MB/s in Redditor's testing

You can use Xbox Expansion Cards on PC with a CFexpress adapter since these cards use a standard CFexpress Type-B connector. There are various options available such as PCIe to CFexpress or M.2 to CFexpress, and all of them are inexpensive. You just need to format the Expansion Card before it's useable, but don't expect blazing-fast speeds afterward.