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LNXLink - Link your Linux computer into Home Assistant
(bkbilly.gitbook.io)
Home Assistant is open source home automation that puts local control and privacy first. Powered by a worldwide community of tinkerers and DIY enthusiasts. Perfect to run on a Raspberry Pi or a local server. Available for free at home-assistant.io
If you're using it, Home Assistant natively supports Wake On Lan. This would only be able to handle the shutdown/sleep side of things.
Yeah the nodered flow on the target device is for handling shutdown(sleep) and status reporting back to HomeAssistant, so in HA the computer is a simple switch with on/off states