Secure embedded links in Sway

I see a lot of potential in embedded Power BI reports in Sway, but the only way to do it currently is to publish a public URL that is then embedded - I'd like an option similar to the SharePoint one that would allow organization-level sharing within Sway of a Power BI report without having to make it public first. I don't understand why I can have organization-level security within Power BI and within Sway, but the only way to link the two is by creating a public link to my dashboard/report and data.