This requires some script on the CI backend, which has not been added yet. I asked the CI team for this last month in an Android workgroup meeting, and was told it would take some time before they could get around to it in their work queue, maybe a month or so, so we expect to have it eventually.
You do raise a worthwhile point that even for CI triggers that are currently in use, I believe some of them are not documented there yet, so we should get that doc updated. @justice-adams-apple, is that something you could check, as I think that official CI trigger list is not public?