Hi @James,
Unfortunately, it is not possible to collect Workspace info from JS API at this point.
Since Edge Workspace is a newly released feature, any feedback is welcome. You can leave feedback to request the JS API by clicking the Like or Dislike button at the bottom of the Edge Workspace menu. These buttons are next to the question "Are you satisfied with Workspaces?".
If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
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Best Regards,
Shijie Li