My flat mate and I have recently developed an MQTT bridge for unraid, with support for homeassistant autodiscovery, which also features a REST end point. It allows you to control the servers array state, monitor power status, control VM state as well as hotplug USBs to VMs.
Theres a docker image you can install using this template url: https://github.com/ElectricBrainUK/docker-templates
Let me know if there are major things missing or wrong. Though this is very early stages still so don’t expect it to be completely flawless. But let me know if it is useful! If you have any problems please join our discord https://discord.gg/Qa3Bjr9
If anyone wants to help us extend it you can check out the source code in a repository by the same user as the docker-templates. (Limited to two links, though we are long time HomeAssistant users we are new to the forums as a poster).