Thanks for the FOSS!
Suggestion for future possible backends runtimes: Vulkan, OpenCL, SYCL/OpenVino/intel GPU, AMD gpu/ROCm/HIP.
Vulkan and OpenCL both have the possibility of being very portable to GPUs and also to some extent CPUs that have supporting SW for it.
SYCL can run on various CPU / GPU platforms; it / openvino etc. is the primary ideal target to support intel gpus.