I attempted this with https://github.com/web-platform-tests/wpt/pull/43048, but when I import that I don't get useful results. (It would not be great to have to write a separate test for each permutation either as there's quite a few, though I suppose I could write a script...)
I had made an error here. The only thing that really does not seem to work is the multiple mismatch expectations. You can successfully import these tests, but you don't get coverage you might expect.
*** This bug has been marked as a duplicate of bug 204022 ***