I peeked at the onenote format standard [1] and the obsidian canvas standard. The difference is hilarious. The onenote standard is painfully complex, provided as a .pdf, and binary to boot. Compare to an example obsidian canvas - this is obvious, text-based (I could read it with notepad++) and easy to understand just by reading it:

  {
   "nodes":[
    {"id":"6c711bf8c24c4f5b","x":-226,"y":-62,"width":400,"height":400,"type":"file","file":"testin/2022-10-14.md"},
    {"id":"4dd7d04cdd0b379c","x":-530,"y":-209,"width":250,"height":60,"type":"text","text":"this is a note"}
   ],
   "edges":[
    {"id":"0c589a4d6bbb06aa","fromNode":"4dd7d04cdd0b379c","fromSide":"bottom","toNode":"6c711bf8c24c4f5b","toSide":"left"},
    {"id":"eda9f3edb3ec232a","fromNode":"6c711bf8c24c4f5b","fromSide":"top","toNode":"4dd7d04cdd0b379c","toSide":"right"},
    {"id":"abf404722ba48c3b","fromNode":"4dd7d04cdd0b379c","fromSide":"top","toNode":"6c711bf8c24c4f5b","toSide":"right"}
   ]
  }

[1] https://interoperability.blob.core.windows.net/files/MS-ONE/...