How to get split tabs in Microsoft Edge extensions?

Question

I have working code to get normal tabs and their IDs in my Microsoft Edge extension, but Edge has this new Split-tab feature, and it seams my code can't see the right side "tab", only the left side.

// Get all tabs that match the pattern
const tabs = await chrome.tabs.query({
  url: [
    "https://url.of.website/*"
  ],
});

I can't seam to find the API documentation related Microsoft Edge, if there is any. As this is 404 https://developer.microsoft.com/en-us/microsoft-edge/platform/documentation/extensions/supported-apis/