@Tracey Laird (Hunter New England LHD), Thanks for posting in Q&A.
From your description, I know you want to add individual notes for enrolled device in Intune.
Based on my research, we can go to Intune portal, click Devices and select one device, and click Properties, scroll down, you will find notes, then you can add individual notes.
And you can get the device notes using Graph API.
https://wetterssource.com/get-device-notes-from-graph
Non-official, just for reference.
Hope above information can help you.
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