I would like to build a 3-4 host PCIe fabric using Thunderbolt/USB4 as the interconnect. Are there examples out there of using thunderbolt interdomain communica

I would like to build a 3-4 host PCIe fabric using Thunderbolt/USB4 as the interconnect. Are there examples out there of using thunderbolt interdomain communications between more than two directly connected hosts? Is there any existing body of work on this type of application?