AMDGPU virtio native context is somewhat of an equivalent to the other options, although the pieces are not all available yet. Linux guest only as well.
And there’s Venus but that’s for Vulkan only (but a lot can be done with that alone on Linux guests).
calibre-webis technically not Calibre and is written and maintained by different people, although it does use the Calibre database (and I believe it must be created with desktop Calibre initially). But it’s a good option and I highly recommend it.