Notion

From the share dialog on a dashboard, copy the embeddable URL.

For notion, you'll then need to strip off the iframe tag, you only want the omni URL in the middle.

E.g. instead of: <iframe src="https://omni.test.embed-exploreomni.dev/dashboards/demo-dash"></iframe>

You will want to just grab: https://omni.test.embed-exploreomni.dev/dashboards/demo-dash

Then in Notion, use the slash command /embed and paste in that URL.

Voila! Omni is embedded in Notion.

Note that users will have to authenticate into Omni when they first see the iframe in a notion doc. This works best on the web version of Notion.