Sandeep Pawar has an update for us:
In you case you missed it,
List ConnectionsAdmin API is now live in Fabric. It was shipped in Semantic Link Labs v 0.7.4 a few weeks ago but at the time of the release it was still private. This API returns all the connections set up in the tenant and requires admin privileges. I still can’t find documentation on it so wait for the official details. Note that this API is different from item – list connection API which lists connections used by an item.
Read on to see what you can get from it.